I've done it myself several times but always had atleast 1 person help me. It's easy to get the film stuck to itself on accident, it's easier with two people to cut the film once its on the window, and faster to squeeze the water out too.
Anyways, I figure each roll of tint film is between 12 to 16 bucks (auto parts store prices last time i checked) depending on what 'quality' you get.
You need at least 3 rolls to do a 4 door car. So thats 36$ plus tax plus tint adhesion formula etc.
In the end, the film itself isnt very high quality at all, at most, it'll last a couple years if you're lucky, before it starts turning purple and fading. Not only that, but the rear window I can almost guarantee you, will be so hard to get all the water bubbles out (assuming you do get them all) that youll just frustrate yourself, or will simply not look good.
So it's only 40 some odd dollars, and if it lasts 2 years, you can do it again right?
Except now, you have all this glue on your windows, and if you want to remove the tint to re do it your self, youll be putting a few hours of work with a blade and chemicals to remove it. Or if you do decide to get it done at a shop, they'll charge you around 80$ just to remove the old stuff before they can tint it.
Anyhow, just my two cents. Hope it helps.
