Yeah, especially the rear windshield. Say if you mess up and need to remove it there's always a chance of you pulling the defroster out with the tint. I'd say leave it up to the pro.
I just got mines tinted by a friend who does side jobs on this and only paid $160 for all Windows plus clear bra on the headlight lens and side mirrors with a lifetime warranty. Normally it'll cost a little over $200 which isn't bad either.