Overclocking amd A6 3400m APU

hello,
I have never done this before, but I think I need to learn!
I have a Toshiba Satellite L770D, AMD A6-3400m with 6520 HD graphic APU, 6GB of RAM, 640 GB HDD, and running windows 8 64-bit.
I have been searching the net trying to find why my system is slow, and I think that the processor needs to be OC.
I have never done this before, so, forgive me guys, if I am asking for too much! I need the easiest way and the exact value of the frequencies, the multiplier, and the voltage to do this. Or whatever you see the best.
Thanks.