Overclocking is dangerous for newcomers (i still think im kind of a noob)
List your detailed build specifications (or are they the one in your profile description?)
I never used a video guide, but you can search one on youtube.
If you have, a GT610, and an i3, there's a very limited range to where you can overclock and there'll hardly be any performance difference but will increase chances of damage and risks. My suggestion is, don't overclock a medium-spec build.