My Early 2009 model iMac's Hard Drive crashed suddenly one day. At first I thought it might me something to do with the logic board. I had used a program called Carbon Copy Cloner to make a Bootable copy of my drive a month earlier. I grabbed the external clone drive and booted to it. To my surprise the iMac came up and worked fine, except for the updates that had come across since creating it.
I ordered a 1 TB Hard Drive. Before I have had to scrounge around for the tools to do the job. While on the iFix it site to get the guide for repairing the drive a came across your Pro Tech Toolkit and Magnetic Project Mat. The whole repair with the kit and mat took approximately 1 hour. I have repaired 100's of computers in my time replacing Motherboards, Hard Drives you name it. The Toolkit and Project Mat made the repair so much easier. I didn't even have to get the wife's coffee cups out this time.
Be sure and follow the guide close. Watch for steps that might be left out. The iFix it guys are humans like the rest of us and can leave a step out assuming we know that already. I was prying and prying trying to get my display unit out of the iMac when I saw 4 screws 2 on each side that the guide didn't mention.