Not a simple fix, but definitely worth it.

Mijn probleem

The power button on my iPhone 5 would only work intermittently, which was really annoying. I know Apple will replace it for free, but that requires me not having a phone for over a week--not something I could accept. Also, the battery was becoming really wonky. It would lose its charge very quickly and with 5 to 10% remaining, it would just shut off.

Mijn oplossing

The repair went smoothly. After reviewing the fix guide, I knew I was going to have to take my time. Everything is straightforward, but you have to be patient and there are lots of tiny parts you have to keep organized. I think the hardest part is putting things back together, as you have to do things in reverse and go back up the guide. This sometimes causes you to go a few steps back to realize what the step was actually removing, but it's not that big of a deal. During places where it wasn't clear what was happening, I looked for supplemental videos on YouTube, which helped a lot.

Mijn advies

Take your time and be patient. Keeping track of all of the screws was my biggest worry, but I managed to do that with these tips. #1) Try using a foam drawer liner that you can get at a home hardware store. I had extra from lining some drawers, but they are fairly inexpensive. I've started using this for various electronic repairs because it helps with the static charges, stays in place, and most of all, the tiny holes in them allow me to organize tiny screws and parts in a way that are relative to the device. E.g., if I'm taking parts out that are in the top right of the device, the screws and parts are organized in a similar manner relative to each other and the device. This is really handy when determining which screws go where and keeping them in place, which was a huge time saver and gave me more confidence that I was using the right pieces in the correct spots. #2) For areas where parts were overlapping or really close together, I drew a map that was similar to the photo showing the circles and then placed the screws on the map. When you come back to it when putting it back together, they will be oriented in the correct spots and it will be clear which size of screw goes where. There is one or two screws that weren't magnetized and it was suggested it was this way due to possibly interfering with the compass, which made sense. I wanted to make sure that I didn't put a magnetized screw where it shouldn't be and creating a map made sure the correct screw was in the right spot. #3) The iFixit tweezers and spudgers helps a lot. The parts are super small and trying to pick them up with your fingers is almost impossible. Highly recommend getting the noted screwdrivers and a kit, if you can.