Since I acually was told to look inside that tall thingy that comes with the monitor and keyboard/mouse when I reinstalled, I am less scared than I used to be of the hardware. If you are getting braver, this is a good article, too, just to kinda know what you are looking at:

http://www.bcentral.com/articles/komando/131.asp

The keywords here are GROUNDING and ELECTRIC SHOCK that can KILL you.
Otherwise it looks pretty easy!