Shortly before Christmas the camera on my moms iPhone 4 just simply stopped working. Since it was out of warranty the bill would be a bit larger than she wanted and since I had long be wanting to get myself a decent kit of repair tools for computers/mobile devices I figured I'd kill two birds with one stone. Bought an extra screwdriver for a friend.
What can I say - iFixit FTW - the guide to the repair was easy to follow and even though I have some prior experience with small electronic devices all necessary steps covered. 1-2-3 my mom has a functional camera in her iPhone and she is very happy.
"Take your time" - similar to carpentry take your time to measure twice (read the guide) and cut once. The screws are tiny. Keep them safe. Other than that I'd recommend anyone who wants to save a buck or two to use iFixit all the time, every time.