you can have the fronts up to 20% tint i think, its quite easy to do just need to take your time, i did the rear quarters and screen in my mk4 astra i had a few years back. you need some water with washingup liquid, a scraper and a mate to do it.
first make sure you clean the window 100%
next wet the windows with the soapy water and start to peel the film, now as you peel the film in to its two parts make sure you spray loads of water on this and use the scraper to get the air bubbles out. once the sticky side its all on the window just get the air bubble out and let it dry!
rear screen is the same but can be a little harder as you have the elements for the heated screen so can have a few more bubles in it!
if you plan to do the fronts i would take the glass out as it would work out much better, but i would also leave them to dry for a day or so before re-fitting and dont use the windows ( up and down) for about a week after fitting the film
its not that hard, just take your time and i did have to start again at a few points when it went tits

oh and i wouldnt try doing it my self again! lol
