Not Very Handy With Tools, Got It Done Anyway
20 - 30 Minuten
Battery wouldn't hold charge more than a few minutes.
Went smoothly - not all the steps in the written instructions seemed to be applicable but was very easy to follow. It was more difficult than I thought it'd be (I'm not very good with home repair) but it wasn't hard overall (and was even kind of fun) and I successfully replaced the battery and got the phone reassembled. Powered on without problems and is working great! Took about 30 minutes start to finish.
It helps to have a pair of tweezers on hand - one of the screws has a tiny brace to hold the phone camera in place and I had to use the tweezers to get everything lined up properly when I reassembled the phone. Also, be careful when you start loosening the screws - the mainframe component piece on our phone was screwed down pretty tight so once I started loosening screws one of them shot out of the phone like a rocket.