2004 Chevy Tracker Rear Wiper Motor Replacement

I belive my rear wiper motor is out. I can tell you that I can physically move the wiper when I have it turned on and I have checked the fuse. I was thinking of buying a wiper motor for a parts store and replacing it myself, but I wan some reassurance that this isn't a difficult fix to do. I am in the same situation with my driver door handle and driver window being out of track. I am attempting fixing these myself. Well at least the handle!