what parts do you want to ramp up?
fsb
memory
proc only
vidoe card
its very easy to do and you would go about doing the same way you would tune boost on a car. Turn it up a lil, run some apps, see if it crashes. Turn it up a lil run some apps see if it crashes. you want to stay in the 5x degrees celcius range as your max. granted they can go higher but thats a safe bet to stay around.
Things to consider purchasing. better proc. heat sink, memory heat sinks, northbridge cooler (a better one since you prolly already have one), southbridge cooler ( you may no have one and once O/C it'll get hotter. Also how strong is your power supply. Turning up the power to the items you overclock as well as the extra load the new fans add will be higher. How many watts is you powersupply? how many amps is it?
if you google the topic you can find a shitton of info.