i tinted my windows myself, it was difficult at first, but once you get the hang of it, its easy peasy. I took the glass out first. I did it all with the crappest cheap and nasty "Max Power" film from the wholesalers @ £2 a roll.
Front window tints, regardless of tint are 100% illegal, they changed the law in 2004. Only way you are allowed them is if the car was factory fitted as standard with that level of tint. Mine are tinted at 60% I think, hard to tell really - but its way too dark at night, a right pig to drive. I'm going to remove the tints as they are just annoying me now. I think if I just remove the fronts it may look a little retarded.