If your doing a curved window say a rear window or front windshield (whole thing) you need to get the tint to the shape of your window first... lay some baby powder on the OUTSIDE of the window (this keeps the film from sticking) cut a peice slightly larger than the window your cutting, lay the film on the window with the adhesive side up (this will make the film shape to the window with the adhesive side in the right place, once you have the tint layed out on the outside of the window grab yourself either a heat gun or a blow dryer (heat gun preferably) and turn it on oh say a medium setting (different ones vary) start at the middle and heat up the film to take the shape of the glass, work your way from the middle out, remember the slower the better with this type of work... once its all shaped your ready to trim and applyAnother thing, CLEAN CLEAN CLEAN!!!! Get your windows CLEAN!!!! EVERYTHING will show up under the tint... this is by far the most important step!!!