Need help over clocking my system

Hey I need help! I've never OC'd before so I need to know what the best program to use is? I recently purchaced The XFX 7870 Core Edition and the AMD FX-6300 with a Cooler Master Hyper 212 EVO to cool it. I'd like to know if anyone has any known stable OC's for these products.

I would take the CPU to 4.2gHz at 1.33V. Raise the GPU using MSI Afterburner; power target 113%, clock spped +100mHz for starters.