This video is excellent.
http://m.youtube.com/watch?v=eX778DaVJYE
The installation is not difficult but the key is not trapping anything underneath. I am suuuuuper retentive and the tiniest spec would drive me insane. Whenever I install a screen protector I thoroughly clean the table, turn off the ventilation system, wash my hands very, very well then pour alcohol over my fingers (so as not to get fingerprints underneath on the adhesive), and clean the screen thoroughly with alcohol. Again, I'm just kinda nuts like that. I placed it on with natural light from a window to get it perfectly placed. You can lift an edge a adjust it if needed, but you wanna then just let it go completely and let it seal itself. Most bubbles come out on their own that way, and will work themselves out in a day or so. But again, being retention, I use quite a bit of force with a credit card to force out any air right away.
I have never had a jelly button or aluminum button fall off, or even hint as though they may. They seal very well, but also peel off when needed. The aluminum buttons are very thin, so they are likely to bend if you are rough removing them from their packaging or from your device.
This protector can take tremendous advise without scratching. I've seen YouTube videos where they use all kinds of weapons to try and scratch them, to no avail. I bet this one will shock you:
http://m.youtube.com/watch?v=K7MU7WxVT-E