I don't think dictators actually start out with the thought, "I think I shall start working towards a dictatorship tomorrow! How shall I set about it? I know, at first I will . . ."
What probably happens is that they see a "gap in the market" that they feel they could fill. There may be a need for changes in the country, or a key post falls vacant, or they have novel ideas which are not being accepted by traditional routes.
So they campaign for what they want, first at a low level then getting higher and higher as they persuade others to join them, back them for a political position, lobby for the changes they would like and so on.
If there is something that a disillusioned population latches onto, a keen orator with powers of persuasion can rise on a tide of fervour to dizzy heights. Opposition is dismissed as "enemies of the people" and when the ambitious climber has some power, he replaces all the officials he can with others who sympathise with his cause and back his legislation and his other appointments, while those who resist are sidelined, or their reputations blackened by a servile or partisan press.
Gradually the "champion of the people against the establishment" becomes the establishment himself, but with a background of ruthlessness, dirty work, and disdain for the humdrum processes of democracy that he has defeated.
In a genuine democracy where everyone contributes a little to governing, the job of every member is to be alert for the beginnings of such an nsidious rise. It is often said that the price of freedom is eternal vigilance. If we abdicate the use of vigilance, we will eventuallt pay the price.