How do you fix a window that's stuck for a 2003 Chevrolet Cavalier?

stuck how? I assume you mean on the way up or down, there are a few answers to this,, it could be the molding pinching the glass itself,, but in most cases its a misalignment of the glass as it travels in the track, window glass is secured at the bottom and often comes loose, to remedy this, you have to remove the inner door panel, and tighten that mount