My basic tips for hardware work:
Take your time. Look up nicely documented teardowns with step by step pictures in decent resolution. When you buy the parts for a repair, get yourself an anti-static grounding strap while you're at it - they're cheap and can save you from costly problems. Once you come to doing work, draw around your device on a bit of paper before you even open it and put any screws that come out in the corresponding place with little circles around them - you always think that you'll remember where each one came from, but won't. Take your time - that one bears repeating, because it's very easy to get frustrated with slow progress and end up bitterly regretting ten seconds as a barbarian.
The main trick is to be calm and methodical through the whole process. As long as you are, hardware repairs don't have to be the black voodoo people sometimes think they are.
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