This crucially depends on what you mean by "democracy". Like democracy technically means "rule of the people" and so refers to a kind of government of the people, for the people, by the people.
So ideally it would incorporate concepts like everyone being electable and able to elect, transparent decision making, active participation and involvement, access to information, discussion, debate, compromises, etc.
And apart from maybe some time (informed decisions, discussions, research, education, etc. might take at least some time) the requirement for that is actually quite low. Whether you have a group meeting of hunters and gatherers where they talk through roles and tactics of hunting or finding places to gather or whether you have more technologically advanced societies, the concept of getting together and deciding what to do next in a gathering of equals is not really something that requires much pre-requisists. On the contrary over time people will usually get better at this because they get a broader insight about what are the topics that are most relevant to society, what are the reasons for why individuals veto decisions and are they warranted and what can we do to solve these problems. This is knowledge that you will inevitably acquire just by doing the process. You will see what works, ask questions about how things work, see what doesn't work, you might already be able to interject that something doesn't work because you've learned that the hard way, even if you haven't yet figured out stuff that actually works, aso. Even people without a formal education are usually not without knowledge or intelligence and even if it's just the knowledge about themselves, which they have 1st hand access to while the decision makers would need to eyeball that by surveys, statistics and whatnot.
So this idea of a benevolent dictatorship or of an education to self-government is always kinda iffy because if you follow the lead and fit into a role assigned to you by someone else, then you're not practicing or preparing for democracy, in fact you do the opposite. You practice your role in an authoritarian and hierarchical system where it's simply not your job to be concerned with politics and so your lack of education is "fixed", simply by pretending it's not a problem (which it still is)...
So what happens in the worst case is that your "benevolent" dictator turns into a (not-so-benevolent) dictator and then you are shit out of luck because you might no longer have the means to overthrow him or even if you can, you have no idea how the state apparatus actually works, so either you need to learn that by doing (which you could/should have done way earlier and which doesn't make it easier) or you just end up emulating the system you overthrew and thus perpetuating it and ending up with another dictator (benevolent or malevolent).
Though after saying that there are very few technical requirements to that. One might add that there are still some requirements to that:
Like first of all people need to want that. Sounds stupid and recently scammers have given the term "mindset" a really bad reputation, but you kinda need a population willing to take up the challenge. To not accept a "savior narrative" where they are told to keep calm and carry on while people supposedly more smart than themselves will just handle it for them. They need to want to know what is on, what are the relevant questions, why, what is being done, why is it being done, what are the benefits and drawbacks, want to get involved and want people to explain their steps. Democracy lives from active participation of the population. More than an existing base of knowledge you need the curiosity and the understanding that you are now a decision maker, neither a king who is served, nor a servant who is commanded, you need to do shit yourself in cooperation with other people.
And that is a problem not just for novel democracies, for technologically developing countries and so on, but for all democracies. If you think peak democracy is being able to elect your leaders, if you want strong leadership, if you think the most capable should make the decisions and the rest follow their lead. Then those are not democratic ideas and ideals these are authoritarian ideas and if a majority wants those then there's only so much a democracy can do about it, so democracies need democrats.
The second major problem is a willingness to deal with other people. To be able to deal with pluralism, accept equality and freedom of other people and develop means of constructive conflict resolution. The thing is the bigger a community gets the more pluralism becomes inevitable. If all people did the same at the same time you will find it impossible to acquire the necessary resources for that. Also one event could kill the entire population because no one would be prepared as all are too identical. At the same time, the more your lives differ from each other the harder it is to communicate ideas, ideals, requirements, necessities, goals, hopes, dreams and aspirations. So disagreement and conflict is to some extend inevitable, but you need to find ways to deal with it constructively.
Because if you don't, then you'll either break apart as a society (whether that's good or bad depends on the circumstances) and/or you'll develop structures that are very undemocratic, oppression of minorities and throwing groups or individuals under the bus (for whom the system will not express itself as democracy). And the more militant the conflict becomes the harder the decision making is going to be, because before you could even tackle the issue you'd need to clear the problem of not getting onto each other's throats, because caring for one's own safety usually takes priority over all other issues.
And lastly (again) you need time. Getting to know each other and one's problems making decisions that don't unintentionally throw people under the bus, that don't overpower others and disenfranchise them, that accept seemingly stupid questions and are willing to also improve one's ability to explain instead of just raising the demand for the learners and all these things. That takes time. It's very well possible to have that time be cut short if people are already on the same page and if education, understanding and trust is high, while it might take considerably longer if people don't know what it's about, don't get what is at stake and distrust everyone in the room. So you might compare it to paying in advance vs taking on a credit. If you put in the trouble at the start and work on your democracy you likely might even gain time from that, because you might have a lot less trouble in the long run, then if you make a split second decision which cuts that time tremendously but where you end up paying a lot more because the problems that you ignored pile up via interest rates.
So this idea of implementing democracy "top down", is usually rather complicated, because having a small government of few people requires a hug workload in terms of education from these people, that you wouldn't have if you spread that over more people. It also creates an instant class and caste difference between the people because of that, so even if "de jure" a democracy it can quite easily transform into an oligarchy as there is no alternative. Also a tight time schedule for decisions can mean that you don't really have time for planning and making careful and considerate decisions, but the necessity to start acting NOW. So this again favors anti-democratic structures where you have a small leadership fast decision making and people on the bottom acting according to their role rather than bothering themselves with requirements of a job that they don't have.
However as we've seen in history, these ideas often times fail. So ironically "dictator" was historically a temporary position. Like when the Roman republic was in trouble the senate and consuls and the other institutions that were meant to keep each other in check could give up a large amount of their power to a single leader that would be given enormous privileges and a 6 month time frame to basically utilize the entire power of the empire to solve a particular problem. It didn't take long before Caesar used that power not just to solve a problem but to make himself dictator for life and without special purpose and for leaders of empires to use variations of his name for their title, "tsar" (Russian emperor), "kaiser" (German emperor), "Qayser" (Turkish emperor).
So this supposed time saved by an authoritarian is bought with a heavy price and quite often creates more problems than it actually solves. That being said if the situation is bad enough, if there is already an acceptance for throwing people under the bus, if people are able to be played against each other (divide and conquer) and if "simple solutions to complex problems" in combination with a "savior narrative" are pervasive then this can easily kill a democracy. And in that case a lack of education can be an aggrevating factor, because it can encourage trust in misinformation, sucking up "us" vs "them" narratives, a willingness to accept authority and savior figures, a distorted view of history where exactly those figures often ended up being the ones who write down what happened while the history between the lines is something that would take much longer to learn. Edit: Or people might simply be more receptive to the idea of "urgency", when they actually would have the time for democracy. Also for completion it could also happen that they are not educated but simply stubborn and thus still block decision making for better or worse.
So while not necessarily a requirement for people to be highly educated in order to have a democracy, it might nonetheless help especially if you shoot for a less direct and more representative democracy where you don't necessarily learn on the job but need to do that in your spare time.
So ironically that can often make it harder rather than easier.