10 - 30 minuten
My battery life was terrible. I wanted to wait to the next iPhone (maybe even longer, who knows), so I needed a stopgap to get me there without buying a phone from desperation.
It went pretty well until I got to the part where I removed the battery connection at step 4. I warned to be careful, but I didn't really know what direction to pull the plug. It turned out that it popped our vertically off the board, but I used a video I found on YouTube for that step.
I also had trouble getting the old battery off the phone, I tried pulling the plastic part, but it ripped a little. I just pried it from the other end until it came off.
Once I turned the phone back on, the phone didn't get signal. I looked and saw some strange blow on the Nintendo cartridge kind of advise. I just restarted my phone again, and it connected like normal. It may have just been the lack of charge that caused the boot to take longer than normal. I have no idea. I'd like to have some more info on that though.
Look up a video on how to remove the connector, but in short, it pops off vertically.
Regarding the "pressure contact" in the third picture in step 4 (mentioned in the first warning in step 5 for some reason), just don't touch it with your fingers. Get a set of plastic tweezers or just use the plastic prying tool to touch it. I didn't feel like going out to buy Windex or the like mid-repair, since it wasn't in the Tools section.