Upgrading and repairing your computer by installing recycled computer parts is typically the same as installing parts you bought off the shelf. However, keep in mind that in some cases you may actually be downgrading your computer when you use old computer parts. You also won't have a handy instruction manual for installation as you would if you installed brand new computer parts. To solve this problem, check the website of the manufacturer of your computer or of the recycled computer part. The chances are good that they will have specific instructions on how to install the recycled computer upgrade. If you can't find instructions on how to install the specific computer part, check a trusted computer website such as CNET for general instructions on installing that type of part.
Also, never attempt to repair a broken computer part. It will probably be a waste of your time, and in some cases it could be dangerous. Instead, recycle the broken part and install another one, even if it means you have to downgrade. You can always replace the computer part with an upgrade part later on.
These tips should help you get started doing computer repairs and upgrades at home with recycled parts. You'll save money, prevent waste of the Earth's resources and still end up with a much better computer.