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Your friend is probably thinking of opening a hard drive rather than a laptop. Hard drives require clean rooms, laptop's don't.
Follow the directions for disassembly to a T. There are numerous hidden tabs that you can't see. a part may be held by 5 tabs and one screw. break the tabs and you may have to reassemble with duct tape.
I tape the screws to sheets of paper in their approximate location in the laptop so nothing gets lost or the wrong length is used on reassemby. it's usually two or three sheets as they tend to come apart in layers
use a strong light. I like to put a sheet on the floor if working over carpet in case a screw is dropped
Good luck with it. They're really not that hard to work on. Just follow the directions
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