mine cost me 7-95, did it myself with the film stuff,  You can get good results with a little time,  i had all the windows out to do it though.  The film came with full instructions and a plastic smoother outerer and a trimming knife, you just spray a little water on the glass with a mist spray bottle, this allows the film to be moved around, then use the smoother to force out any creases and water,dry & trim jobs a good un.  It also sticks to carpet and dining room tables so if you have a go bear that in mind  :roll:
Ady