It's easy. Just a #1 Philips head screwdriver and usually 2 screws.
There is an emblem next to each screw for a hard drive. It looks like a Cylinder with a lid.
If you want, drop me a line and I can meet you somewhere and pop it out for ya.
I'd offer to help ya install the fan, but it takes me about an hour and tons of tiny parts that can be lost or broken... If its free for warranty work, take advantage of it!