I put Zagg on also. I learned the hard way not to overwork it once you have it down. I might have put a mark in the skin from the squeegee while trying to get a bubble out. Now that it's done, I balanced the phone on its edge between some padded books and look forward to seeing how it adheres overnight. I figured keeping both sides open and airy will lead to a nice result on both sides.
One complaint is the cut outs. The weren't cut deep enough to simply pull them away and I had to X-Acto blade them away before releasing from the liner. Otherwise, it would have been almost impossible to remove them cleanly after application without either tearing the hole design, or scratching the glass underneath that precise spot.