Hey Leigh K,
the automatic overclock is fine to use to start with, you may need to adjust your memory timings/frequency manually though. I used that auto overclock 20% feature to take an E5200 from 2.5GHz to 3GHz and an E8400 from 3.0GHz to 3.6GHz, totally stable and the board did most of the work.
In the future you may find manually overclocking gives a better result but to start it seems like a nice easy speed boost!