Grounding advice?

[Ningamer]

I'm building a new computer soon, but I'm not too sure about how to ground myself. I'll most likely be working in a room with a completely wooden floor, would sitting on the floor in there with an arm against a radiator be sufficient to keep me grounded? I'd rather not wear a grounding bracelet, and I'd rather not have the PSU plugged in. Can somebody tell me another good way to ground myself?

 

[Ningamer]

Awesome, thanks for the help! Hopefully I'll have this thing up and running by tomorrow

EDIT: One more thing, if I have the PSU plugged into the wall, does the wall socket have to be off or on?