Honestly, is quite easy, I'd just put 10 hours of reading into it before attmepting to do so.
You'll see large decreases in rendering time for both photoshop and premiere.
Any other advise relating to OC??
Stay within the bounds of the hardware.
Get aftermarket cooling.
Don't go crazy and try to achieve more then you should, google other peoples results with similar hardware.
Overclock in 15MHz increments.
BE SURE it's 24 hour prime stable. If you use this for a work computer and it doesn't pass the 24hour stress test your computer could be instable, resulting in a blue screen or lock up, which will cause you to lose all your work.
Overclock only one product at a time, don't overclock both your RAM and CPU at the same time, if you ever encountered an issue, it'd be difficult to rule out.
Edited by james_8970, 29 February 2008 - 10:14 PM.