I tried to use ET6 once when I first got my UD5, I tried to raise Bclk up 5MHz, and when I pressed the set button it locked up my PC and I had to reset my system.
Overclocking via the BIOS is really easy, it does seem a little bit daunting to begin with, but if you read up about your board on this forum and others, you will get the hang of it in no time...