The volume up bottom on the phone wasn't working. These parts and 3 hours and it was as good as new, except for one thing.
Replair went smoothly. Sorted screws on old hard drive magnets. Took 1 hour to get apart. 1 1/2 to get it back together. Everything worked except for one thing. The silent button wouldn't work after the repair. It kept falling out into the phone because of a missing stopper or something. I was able to cram a piece of a rubber band in there. That fixed it. Everything else went smoothly.
Keep track of your screws and keep them sorted. Don't lose rubber stoppers.
iPhone 4S Headphone Jack & Volume Control Cable
P5 Pentalobe Screwdriver Retina MacBook Pro and Air
iFixit Opening Tool
iPhone 4 and 4S Volume Button