Hello! I've decided that I'm going to stick out another year with my iPhone 3GS. I've gotten tired of cases, and have 2 Bestskinsever 1 Piece Backs coming in the mail. I've read several ways to install, but don't know how great the methods are. What is the BEST way to install the skin? I'm sure it's the same for any other brand... Thanks, and happy 4th.