I've used all the skin products (bodyguardz, IS, SGP, BSE etc). I like the bodyguardz a lot, and don't particularly care for the IS. That being said, the IS includes this rubber squeegee with their film, and I've used that for every other skin i've ever applied, and it works REALLY well to get out all the airbubbles when you install.
What I do, is after it's layed down perfectly, I lift up one half (from the center to the top), and squeegee it back down, then I do the same with the other half. This gets rid of 99% of bubbles. Then, i use the smaller end of that squeegee to push out the smaller microbubbles, so that when it's done, i have close to zero bubbles.
Anyway, I've got about 15 of those squeegees, from installing various friends ISs and my own, so if anyone wants one, PM me.