i have tinted all my own cars, but u do have to have some experince to do it. you must know how to do stress cuts for the back or if you know how to heat the tint to form to the window. pretty much leave it to a professional unless you have a lot of patience
Y'all live in the Sun Belt where tinted windows are as common as sliced bread. Up here in Maine, well.....tint is purely a cosmetic thing, a luxury, and there are very few shops so that's why it's more.