The easiest thing for the door window is once you place the tint on the window, start dead center of the window and make a swipe up to the top, then one down. this will help hold the tint in place. Then again back to the center and go up on each side of the first swipe and do that until you get to the outer edges. Do the same for the lower half. After your done with that, then work the rest of the edges. The extra that will go down inside the door, I always found it easier to use something like 2 cards. About the size and sturdiness of your drivers license. One to pull back the weather stipping and one to get the tint behind it. Don't forget to soak down your squeege and tint when appling it to keep from preventing scratches. Same thing as above for the back window. Just a little more work because the rear glass has two curves in it.