hardocp.com also has a lot of good OCing stuff...

OCing your first time doesn't have to end in disaster, Angelic. Just work your way up slowly increasing the voltages on your CPU. The hardest part is unlocking the CPU multiplier. It's easy to keep from messing stuff up if you pay attention to your CPU temp.

For how much performance you will get, it really depends on the CPU version and the CPU you got from the manufacturer itself, as ever CPU is a little different. My 2800+ may be able to gain 300Mhz with no real heat problems, whereas yours, with the same core and about the same creation date, may only be able to get 150Mhz.