Overclocking a intel core 2 quad q8400

HI guys,
I'm a total noob at overclocking,i have gigabyte g31 ems2l motherboard,my cpu temps are at around 38-40 C at idle,and jump to 52-53 C on load,on conversion of 4gb video files(incidentantly it took 46 minutes to convert to .mkv).
The thing is how do i overclock it,i know it has something to do with increase multipliers,bus speeds,ram overvoltages etc.
I do not know the exact things to do also.
Moreover,Its on Stock cooling..and i have a zebronics desire cabinet with 2 x 80mm fans on the side..

Any ideas??

Simple steps

Go into BIOS, increase FSB, some things that are taken for granted,
- you have good Power Supply
- you have good cooling in your system, after market cooling solutions are recommended since you are using a Quad

After increasing FSB, check with tools like LinX, OCT, IntelBurnTest to check for stability
- Start with lower multiplier, this can be skipped
- Once you are unable to push more you can try by increasing he vCore

Here are some guides that will help you

AnandTech - HOWTO: Overclock C2Q (Quads) and C2D (Duals) - A Guide v1.7

HOWTO: Overclock C2Q (Quads) and C2D (Duals) - Guide v1.6.1

- Its a trial and error game and needs lot of patience

Hope this helps