Then you'll need to talk to Lincoln if you want to learn the language and the culture. He was one of them.
That's useful, but it means nothing if you don't understand what you're getting yourself into. You need to understand their world, their customs, their language, their history, before you can pretend to be one of them. You can't just slap on a new face and pretend that's enough to get by. You'd only get yourself, and the rest of the group, killed.