Make sure you don't get rid of old manuals, warrantees, and receipts. You obviously always want to keep the old warranties and receipts on hand if you have a warrantee on your computer in case something goes wrong. Holding on to old manuals is important too though; say something goes wrong with your computer when you install a new part, sometimes old manuals can give you troubleshooting tips on how to make everything work together in harmony again.
Most importantly I would say you don't want to be rough with your computer parts, a lot of them are very fragile. You never want to force parts together. Parts in the computer world are designed to fit nice and smoothly together with very minimal effort on your part, if things don't seem to be working, try twisting parts or flipping them or whatever it's possible to try without cramming anything inside anything else. Bending cards is also a terrible idea. While fiberglass boards are very tempting to bend you must resist the urge, there are circuits on the board that are very fragile and that can get cracks in them that are too small for you to see, but big enough to damage the card. You really don't want to rush yourself when installing a new part, this can make you nervous or easily frustrated, and both of these emotions can inadvertently lead to damaged parts.
You never want to open up monitors or power supplies. The parts inside monitors and power supplies are irreplaceable, so if one breaks you're just going to have to get yourself a whole new one. Not only are the parts irreplaceable but opening up these parts is dangerous as well, both of these parts store electricity and can zap you if you try to open them up.
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