EX58A-UD3R overclock noob

First off, new poster on here. Also just built my first computer and looking to learn a bit about overclocking.

So I've done a lot of searching and played with my BIOS some... but my computer just shuts down after the changes. I'm just trying to do a mild overclock on the stock cooler for an i7 920. I'm at 2.66GHz and I have read that 3.2GHz is safe with stock cooling, which is my goal. BTW, if anyone has any recommendations on anything, lay it on me. I will probably be upgrading my cooling, but for now I just want to know the ins and outs of OC'ing. Here are my specs:

Gigabyte EX58A-UD3R

Core i7 920 @ 2.66GHz

Kingston HyperX 6GB (6 x 1GB) 240-Pin DDR3 SDRAM DDR3 1800

Windows 7 64 bit Pro

Seagate Barracuda LP 1.5TB 5900 RPM

ABS Canyon 595 case.

XFX HD-585A-ZNBC Radeon HD 5850 (Cypress Pro)


I appreciate any help,
Jake