I used this kit to install a Samsung 850 Pro in my 2011 iMac. I followed the video and the whole thing took about 1 1/4 hours. At this point dust cleaning is included and I was driving very slowly. The kit comes with paper for sorting different sized screws which was very helpful. I'd suggest taking some closeups of the motherboard/connectors so you know how to put it all back together. The three screws in the middle of the motherboard had two different sized heads. I don't think it matters what goes where, but I put the smaller screw in the middle. Formatting the drive after installation was easy, as was reinstalling a fresh copy of the operating system.
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