The process of creating a duchy is not complex at all. All you do is select a lord and click a button. *poof* That lord become the duke of a new duchy. This is not complex or difficult, and it all explained already in the game, on the page where you do it.
That process isn't complicated so long as you don't care who becomes duke of the new duchy. Having a specific person makes it a little harder, and trying to have yourself become that duke is even more complicated, it's easier to get tripped up then you might think.
