watch enough videos and you will get the confidence. its all about cleaning the glass real good, like Windex and a razor blade, and steel wool.
then a heat gun is nice to have, as you fit the tint on the outside, then shrink it tot he glass, then put it on the inside.
when you see cars with all them bubbles in the back window tint, thats because they never shrunk the tint to fit the glass. i got no bubbles at all in my back window, or brow. the only problem i had was the very first back window i did, the bottom came loose and tore off some, so i had to cut it off to keep it from getting worse. but that was the very first window i did, (ever) the last window was the best one of course, so round two should be a much better job over all. still looks good, never heard any one say it looked bad. most are shocked i did it myself.
EDIT: if you look at all my cars pics, you will see the driver side back window is always open 2 inches, this hides that torn tint lol ill rat myself out lol
