the rear window with defroster lines will be a mess. Side windows etc.. the process is fairl simple. I would park the car in the sun, and start peeling up the edge. see what you can peel away. The top layer is easy.. but try to peel both layers at once. Then, take some amonia solution.. and let it soak on the windows. Then use a new razor blade.

I personally.. wouldn't tackle the back window. Its a mess.