I did a very similar upgrade a couple of months ago for a family member’s 2011 iMac.
Stephen Feger

Sorry you found removing the LCD screen so difficult. I watched 4 or 5 YouTube videos before my first attempt. There’s only 4 cables and once your comfortable with those it’s a breeze. I’m down to 25 minutes by my third machine. Hopefully that will boost your confidence to try again!

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