15 minuten - 1 uur
The main problem started with the power button intermittently working, and eventually randomly working on it's own. It was annoying having screenshots taken at random, and the phone randomly trying to shut down, including while having conversations with other people.
The secondary problem I found, was that the battery would run down very very quickly especially in the cold. Right before replacing it, it had gotten so bad that the battery would fail halfway through the day, and would take hours of charging just for it to start again.
The fix went surprisingly smooth; I drew quadrants on a piece of paper and I applied double sided tape to each quadrant, in order to hold my screws in exactly the same order that I took them out in (made things much simpler, IFitit does sell a tray to do exactly that but I didn't come across it until after the fix was completed). I carefully followed the Ifixit guide with great success. The power button itself was more difficult to take out then the guide would lead you to believe, but with a little convincing it came out.
One thing I discovered after reassembling the entire phone, is that it would be a good idea to keep an eye on where the camera is and if the lens gets touched. I thought I had been pretty careful with it, as it turns out I would've needed to clean it anyway before reassembling (the environmental dust of my home was enough to fog it up with specs of something). I've yet to set aside the time to pull it back apart to clean the lens off, i'm not overly worried about it until then.