02 330ci side windows

Im trying to tint front side windows of a 2 door 2002 3 series. The tint is a generic brand. I did not remove the door panel or the felt just tucked the tint under it at the bottom.The problem was at the bottom along the door panel area, i had about 7 to 8 2 inch long fingers of air under the film. The rest of the tint sat good no bubbles under it, but no mater how hard it pushed or tried to walk the air out it just re poped back up. It seemed like air and not water under the film.
im looking for tips on what i did wrong. I cut 2 pieces and both times it did this. do you guys usually shrink these side windows. thanks for the adivce

Just take it to a professional, why would you want a marginal looking job on a nice car like that?
Keep it legal and good luck.

i hear you on that, but its my own car, using it for practice. so i wanted to see if the side windows needed to be shrunk before installing the film