gr8vfr pretty much said what you need to do, but here's a few more hints
I would recommend removing the glass from the car if you are handy removing and replacing the glass without marring it. If you are good, you'll get a complete glass film and not have to worry about the fuzzy wiper catching on the lower edge as you roll the window down. Plus you'll be able to trim the edge of the film right down to the last 1/16th of an inch away from the edge.
Another hint is from a friend of mine who used to do these in Iowa. AFTER the film has been installed and you've released all the bubbles by squeegeeing them out or as a last resort popping them with a pin (Very much last resort, since a bubble can usually be traced down to dirt or some other imperfection not allowing the film to adhere.) Get some CLEAR nail polish and the thinner for that brand of nail polish, THIN IT OUT slightly, and apply it to the edges of the film. This helps seal the edge and gives it a little bit of a ramped start so that the edge isn't so raw.
Lastly, definitely use a hair dryer or heat gun, but be CAREFUL. It doesn't take a lot of heat to shrink that film, and if you shrink it too much it will pull in weird angles and more than likely separate from the glass. Remember, the film DOES have adhesive on it, the water and shampoo are to get the film on the glass. The exposure to sunshine and heat is what activates the film's adhesive. A heat gun or hair dryer will do the same but very very fast.
FWIW