I found this guide to be very useful. The installation was super easy, especially since I've never opened my iMac before. I was able to skip steps 6, 7, 9, 10 and 14. Wish I had one of those long skinny magnetic torx screwdriver's though. I had to use duct tape to hold the screws on the end of the bit for step 12.

I used this opportunity to vacuum out the dust with mini attachments. Much needed after 3 years ;0)

Awesome site!!! Thanks for sharing your knowledge and saving me time and $$$!