There's always the Catalyst interface. It should contain a tab for overclocking your card. You'll have to click on the lock to unlock the utility. Then you can try the auto tune function.
As far as a FAQ or step by step guide, I don't know. I've always upped the clock on the memory until artifacts or crashes, then upped the clock on the core until artifacts or crashes. I use the various 3DMarks to push the card.