Athlon II X4 630 + M4A77TD overclock

Hello. This might be another overclocking forum post but it is quite important to me since I have not overclocked before. I already read over many guides how to overclock but I have not tried it.

I would like to overclock my CPU a bit since it is somewhat bottle necking my XFX HD 6870 card.

My specs are
AMD Athlon II x4 630 stock fan/heatsink
Corsair 4 gigs of ram DDR3 at 1333 mhz
Asus mobo M4A77TD

Right now everything is at stock voltage and clock. I would like to get to around 3.5 ghz.

Thanks for reading.