The Ministers experience with the functions of their portfolio is not actually their function. Assuming the legal tradition of the Common Law countries after the revolution of 1688, (when the Executive forever lost the power to act according to its own intent), the Ministers are responsible to the Parliament for the Legislation and Actions of the Ministry.
By this it is meant they are responsible for obtaining Parliamentary approval (legislative approval) for all Actions of the Ministry, and they are responsible for ensuring that all Actions of the Ministry are only those Actions that Legislation demands.
Essentially they are watchdogs that exist to ensure that Executive power is only used as Parliament demands, and of course making those decisions that legislation clearly demands they must make.
The actual doing of things (the execution of legislation) is the responsibility of servants, who as servants may only exercise their masters power as their master intends.
What you are seeing on TV with the "Minister" presenting themselves as the "Great Leader" is simply politics, they are getting camera time.
In simple terms, even if the minister was highly experienced in their portfolio it would not matter, because the strict delineation between the "mens rea" of the legislature and the "actus rea" of the executive (separation of powers) means the minister could not define what is done even if they were able to.
This is not to say that having some idea of what they are doing would not be a bad thing. It might cut back on some of the dumb ideas that make it to Parliament, but it is not what they are there for.
The skills ministers must have is that they must be competent Legislators necessary to ensuring that all legislative processes necessary to the lawfulness of executive action have been followed.
In essence they are the interface between the legislature and the executive, and it is experience with the functions demanded by this interface that matters, not the duties of the portfolio under the interface.
(Apologies for capitalization - its all over the place)