The Utility Knife is Your Friend When Removing Windows
Besides a pry bar, reciprocating saw, and patience, one of the most valuable tools you can have when removing windows is a utility knife.
A good utility knife helps you cut away the window trim. Otherwise, when you pull away the window trim, you will end up yanking off paint, wallpaper, or even wallboard paper. By using a utility knife when you remove window trim, you separate the two items and no tearing will result.
Be sure to have lots of replacement utility knife blades on hand, too. Buy a mega-pack of 500, and that will take care of you for the next five years.