are the hardest dang things to take apart and clean. Also I highly suggest you don't try this at home unless you know what you are doing. I do know what I'm doing and I still screwed up.

here are a few hints

most of the stuff in computers is low voltage usually between 3-5 volts.
Electronic components are sensitive to magnets and static electricity. Both can destroy parts of your computer and some parts have magnets in them.

Here's one of the area's I went wrong I accidentally put my ram cards on top of my dvd drive. Well I realized right away that there's a big old magnet in the dvd drive! I cried after that because I thought my ram was screwed! I got lucky it was fine. Also your hard drive also has a big powerful magnet in it as well. It's actually the magnet that moves the arm not the head. so don't put other parts near any drives unless it's a static drive. Also never use a magnetic screwdriver, even though I did myself. But I kind of know what I'm doing with it so I risked it. Never touch your screwdriver to any part of your mother board or other electronic components. Also if you have a static free wrist guard it is best but I don't. If you don't have one touch something large and metal to discharge any static that might be built up on your hands.

Avoid wearing anything that builds static, I find flannel or fuzzy material the worse for this. Also avoid working on carpet, it's terrible for static build up.

do not store parts in plastic unless it is the special static free kind that comes with the parts. Plastic and many other insulators build static.

Also use the right screw driver otherwise you can accidentally mess up the screw head and then you can't get the screw out leading to a real problem. I had this problem too, one of the screws was so tight that the screw head got messed up leaving me no hope of getting that off. Luckily I didn't really need to remove that part. So it turned out ok.

Be as gentle as possible with all parts some stuff is very delicate and breaks easily, even worse if you don't know what you are doing. In laptops every thing is extra small, don't yank on soldered wires they can break loose and unless you have a solder gun and are very handy with it you will have a serious problem. If this happens you might try a non solder method like medical tape. As long as the medal is contacting the correct place on the board it should work but it may not carry the correct voltage. (I fixed a digital camera using that technique). You can also buy a special glue for that. It's worth a try if something does go wrong.

Also a desk top is easy to take apart but a laptop is a labyrinth of hidden screws underneath other parts. Don't ever pull and force things apart you will break your laptop that way. Always look very carefully for any hidden screws. remove as much components as possible and look for the hidden screws.

Finally when in doubt look up your laptop with model number on line for any tips on how to dis assemble it.

Always only ever clean your electronic equipment with special computer cleaning spray, It's cheap (about 4$) and I found it at big lots. If the can gets cold its working, use a cloth ON THE CAN if it gets to cold to touch. Never use a rag or anything else on your components. Its too risky rags can build static charge and any other cleaning products will leave a residue. Also do not use a regular vacuum cleaner on it. Moving air on the plastic tubing is another static builder. You can buy a special vacuum for cleaning electronic devices that has a grounding device on it but still it is not really recommended.

Also clean your computer equipment frequently about once a year unless you have a dusty house and you smoke than clean it every few months.

You'd be surprised how important cleaning dust out is. My lappy was overheating and a simple cleaning job was all it took to get it back to normal.

good luck. Any questions I should be able to answer them just message me.