Tinting your windows
I've known guys that could do the easy windows, like the side ones. The curved ones are harder. I would highly recommend taking your car somewhere, you get high-quality tint, high-quality work, and usually a anti-bubble warranty. A warranty on your own work consists of..."Oh crap, a bubble. Guess I doing it over..." But hey, if you wanna try, more power to you, and good luck.