I have one on my phone right now, it's fine. Just wet it and have a paper towel rdy. Once you slap it on use the little credit card tool to push the excess water out from under it and use the paper towel to grab it once it's pressed out from the sides.
They work well, it'll look hazy or foggy for a day or so and you'll wonder if you did it right, but fret not. That's just what they do. After a day or two the moisture that is causing that hazy / foggy look will disappear
Sent from my DROID X