Fan was buzzing very loudly, almost unbearably. Had to replace it, according to my computer savvy friends.
Got the part earlier than I expected, along with the proper tools. The installation went completely smooth, especially considering that I am not at all computer savvy. The new fan runs whisper quiet and I am exceedingly pleased.
Ordering the tools was a good idea. At first I was skeptical but I ended up needing all of them and it's worth it to shell out a few extra bucks. I would definitely use IFixit again.