I can't cope.

That would be crown molding. I can't cope crown molding. I swear to you, I'd have that stuff around every room in our house, including closets, if I knew how to cope. (I'm kidding about the closets...kind of. Not really.) Coping is the cutting you have to do to crown molding to get the corners to fit together. Because crown doesn't fit flat against the wall, you (usually) can't cut it at an angle