Go through the guides. Then take your core voltage off Auto and set your memory voltage to factory recommended values. Change the System Memory Multiplier from AUTO to 2.00, 2.00B, or 2.00D - whichever you need to set the Memory Frequency to twice the FSB. Then when you increase the FSB, the memory clock will rise in in proportion with it. At an FSB of 266 MHz, your memory clock should be at 533 MHz.
Download CPU-Z to check your FSB:RAM ratio. It should be a 1:1 ratio.
You will need better than the stock cooling.
http://www.frostytech.com/
It's not worth the trouble. The chip runs at 2.93 GHz anyway. But if all you want is 3.0 GHz, push the FSB freq to 273MHz. You shouldn't need to do anything else.