The ever so needed battery change!
15 - 30 minuten
It was about two years ago that my computer warned me about a failing battery, but that I could still use it. Being a student at the time, replacing the battery wasn't on my priority list. And since then I got a job doing what I used to have my MBP for, so it's primarily been sitting on my home desk constantly waiting for ifixit to stock up on batteries.
The battery replacement went as smooth as it could, except that my battery screws were a little worn out. So I put a piece of saran wrap on my driver and it worked.
Use saran wrap on your tiny driver to unscrew tiny worn out screws!