It is scary for an actor when you get hired as a lead. No matter what the plot is, it is your job to do something interesting enough to make them want to get inside the lead character's head.
The Westerns I like aren't really comedies. I'm drawn to the scope of them and the land as a central character.
You don't do characters that are the same as you, otherwise why bother to act?
I feel the other element of a western is the land, which is very important in this movie. I mean the land is another character in the piece, actually