As far as I can tell from looking up recipes, what makes a Breton galette a Breton galette is the buckwheat flour, and that it's usually savory. See
this entry in the excellent blog Chocolate & Zucchini for a discussion of galette complète.
So: if you make a crêpe with some other flour, it won't be a galette of the sort you want. It might be delicious, but it won't be what you remember.
Making crêpes is different from making pancakes, but it is not all that difficult if you have a good, clear recipe to follow. (The batter is basically flour, egg, melted butter, and milk, thoroughly mixed and then left to rest a while before cooking.) It does take practice to get the batter the right consistency, and to get it to cover the pan properly. But once you master the skills, it's not difficult. And if you make a big batch of crêpes/galettes, you can freeze the extras to use another time. Very useful item to have on hand.
BTW: if you have access to any form of plain kasha, you could grind your own buckwheat flour.