You start out with any overclock adventure with a little at a time. You make changes reboot, stress test, you then repeat again, again, again etc till you rech your max overclock.
It's not a Ronco TV device you set and forget.
maybe this will help, a VERY VERY good OC guide.http://www.overclockers.com/3-step-guide-overclock-core-i3-i5-i7/
So even before you decide to overclock, get a good cooler first. Learn to put it on right and get good temps at stock.
Don't even start OC till you got that done. Slowwww downnn.