Read, read and read some more. I have just OC'ed my Q6600 to 3.4Ghz or thereabouts and I began with the Tom's guide written by Graysky. It takes patience and time but it is SO worth it when you see your CPU running at uber speeds (well that's how I feel!)
Also, I think overclocking has high addiction potential......good luck.
With a lot of reading? If you don't understand what your doing, you can cause a lot of damage to your stuff. People can tell you to do things, but if you don't understand, or move the wrong setting, ZAP.
For newbies to overclocking, I usually suggest DON'T change any voltages. Not until you know how things work. The Q6600 is 266x9 = 2.4GHz. If you want 3.2GHz, thats 3200 / 9 = 355MHz. I'd actually set the FSB to 400MHz, that way your DDR2-800 ram is actually running at 800MHz. (You did set the FSB:RAM ratio to 1:1 right?) If you then drop the multiplier down to 8, 400MHz x 8 = 3.2GHz. No clue how doable this is without a voltage bump, having a G0 will help. If none of this made ANY sense, DON'T try overclocking.