My MacBook Pro right side fan began to make noise, so I took it out and cleaned it thoroughly. It lasted about 2 more weeks before it died altogether.
I purchased a fan from iFixit. The fan arrived within 4 days and the replacement was done in less than an hour. Pretty straight forward and simple repair.
Some of the screws are very small, so I recommend a very clean, clear workspace. Especially if you are getting old as me and can't see like you once did.