Was given an iPhone 4 that would not start up.
A friend of mine offered to give me her broken iPhone if I could get her pictures off of it for her. I run a local computer/electronic repair shop, and I hadn't had a project like this before, but I decided I would give it a shot.
I followed the walkthrough on ifixit, and the repair went very smoothly. Just take your time and follow the instructions, they work perfectly. The only problem that I had, though, is that the I started taking the phone apart via the GSM guide, and got about 10 steps in before I realized that I was using the wrong guide (I needed a CDMA guide). Maybe we could get a bit clearer indication of which device is featured in circumstances like these, where devices are very similar. Other than that, excellent service ifixit.com, you guys are fantastic. Repair took about 2 hours if I remember correctly.
The magnetic project mat was invaluable, I would suggest it to anyone who works with small electronic parts. Just take it easy and make sure you give yourself plenty of time.
Magnetic Project Mat
iPod touch (4th Gen) Adhesive Strips
iPhone 4 (CDMA/Verizon) Dock Connector