Hey James, welcome to the forums.
I'm a big fan of the 8IEXP, but I hate the Easy Tune program. The concept is nice and being able to adjust your settings in Windows would be easier than going into the BIOS. The problem is, Easy Tune causes a lot of stability problems. I don't recommend installing it on your system.
The best way to overclock your system is to go into the BIOS when the system is posting. You'll see options here for setting your FSB speed and the PCI/AGP speeds (Lock this at 33/66) but Gigabyte hides some of the most important controls and this frustrates some users.
Don't let it get to you. Press Crtl+F1 and this will take you into the Advanced Options page where you can adjust your memory timings and divider ratios.
Also, once you set a good overclock your system should be able to start and run on it every time for years, so starting with an overclock every time you start up shouldn't be a big deal.
Good luck-
BHD