There should be a jumper cap over the CMOS buttons, and that jumper should be pre-set to the "normal" position. Every board I've owned has always had that jumper on. Usually, the jumper is on blocks 1 and 2, which is "normal." To clear the CMOS, you power the PSU off then move the jumper to blocks 2 and 3 for 30 seconds.
Presto.
And no need to have a friend over to do it.
If your CMOS pins do NOT have a jumper, go look in your motherboard box--it should be in there. if you STILL can't find it, you can look for a jumper elsewhere on the board and just use that
As long as it covers pins 2 and 3, it will clear the CMOS. Just replace the jumper back if you borrowed it from a different part of the board.
I'd be VERY shocked if there was not a jumper cap available. Jumper caps are usually red, blue, or green, but sometimes white.
Anyway go look for one. There really SHOULD be one available, either elsehwere on the board, or in the box somewhere.
If your board is totally MISSING the jumper cap, call Gigabyte and tell them your board didn't come with the CMOS jumper cap and they'll send you one.
The screwdriver trick does work, but I hate putting screwdrivers over jumper blocks. But it's always an option. Just make sure the PSU is unplugged.
Anyway, dont be afraid about flashing the BIOS. It's quick and easy. Just DON'T flash while you're overclocked. (I flash mine at 4 ghz but I don't really consider 4 ghz much of an overclock on a 2600k).
Everything will be just fine.
Personally, I always make a USB flash drive bootable (you can use the HP format tool, and windows 98 MS DOS boot files, VERY easy), and copy FlashSPI on it, and the BIOS file image, and flash it in DOS. Since, that way, the flash reports finished right in front, and just sits there waiting for you to power off.