There's a MUCH easier way....
When I was searching for a screen replacement for my Focus, I came across two options. One is the glass, digitizer and LCD combo. Which requires the steps in this write up, and the video that you'll find on youtube. Heat gun, new adhesive, etc.
Along with that option, there is another item that is the glass, digitizer, LCD already installed in the front half of the frame. It comes with the earphone jack already installed. And maybe a few other odd bits. All you have to do is take your phone apart, remove your motherboard with camera and vib motor, and install it in the new chassis. Thats it.
Best part about option #2... ITS THE SAME PRICE AS JUST THE GLASS/LCD/DIGI! I paid $95 shipped. In my opinion, you cant beat it. Even if the heat gun method was only 50 bucks...I would still pay more for the whole frame. Its so easy, so quick, and the best part, you dont have to worry about the new screen popping off because the adhesive failed.
Just my $.02!