I installed the TANKSLAPPER kit with the 3m PRO film, it isn't "perfect" but it's not that hard to do. Just don't start with a large piece that is visible until you get the hand of how it lays down. I started with the TRUNK piece and ruined it ($40 bucks extra)....but if you watch a few videos and follow the directions you'll be fine.
My TIPS:
ONLY Use Johnson AND JOHNSON shampoo (several forums stressed this!)
Wet your hands down before touching the pieces...it will make it easier to handle and keep the oil in your fingers/prints from getting under the film.
Really look for left over fiber from wash mitts and specks of dirt before you lay down the film and work as CLEAN as possible.
Use more lubrication than you think you need. it doesn't hurt and add more on the outside as you lay down the adhesive/squeegee out the water.
Use a rubber squeegee and a microfiber towel. The towel for the edges and to "smush" down any air pockets.
Start in the middle and work your way out to the edges before you LAY DOWN the actual edge, which you should do last. i.e. don't stick the edge of the film down until you've got it perfect. leave a 1/4" plus and if you think you need to re-stick it, pull it up and wet it back down, etc. THE VERY LAST THING is the Edge and you can "Flick" the squeegee around corners and edges sharp and fast to get the last few bubbles. Then SMASH (push and twist) the microfiber along the edges that are not laying down to wick out the moisture. It will then stick.
Find a diabetic needle/syringe. You use that to get any stuck in water pockets to release by moving all the water to ONE bubble if possible in an area and pierce the film to get the film to lay down. AIR POCKETS and small WATER BUBBLES will go away and you can use the microfiber to stick down the pocket later if needed.
Most other imperfections will ease up after some heat cycles in the sun. You can do it yourself. If you demand perfection try a shop, but I doubt you'll get it.

The kit works fine.
Let me know if you have questions.
Dan