The longest part of my repair was waiting for the part...
40 minutes - 1 hour
My hard drive finally went up after 8 years. When I opened up my Mac to clean out dust, I noticed my fan seemed off... Considering it went from loud to silent overnight. I tested it and it was also in need of replacement, so I ordered the part.
Easy as pie. The guide is 100% accurate and the screws are easy to tell apart. Just plugged in the replacement fan and everything went right back together.
Take it slow. Computer repairs are delicate. I've been doing it for years and I know that when you rush, you forget a screw and break a clip or something similar. Don't be afraid to stop where you are and pick up later if you get frustrated.