Just dont scratch them while reinstalling, and youre set.

scratch what? the window? There is a very slim possibility scratching the window as the template is usually cut on a glass window[not cars] to an already precut template for that car, or you could even cut the tint to the size on the back window itself provided you use a stainless steel razor blade knife. as long as your not pressing hard like you would to cut steak, youll be fine. The tint is as thin as a sheet of paper.

im talking bout scratching the tint. surely you know what that means?

On the backing or the adhesive side? only way on the adhesive side you would "scratch" the tint would be to put a crease in it or have dirt underneath or a scratched window, otherwise it was installed improperly.