Hey, not complaining, but someone's bound to say this anyway - this topic's come up several times before, I just did a search for 'moving' and found a few good answers.
Basics are -
Put the fish in a/some big (clean) bucket(s), with the heater and filter still running, keep plants and ornaments in tank water, keep as much tank water as possible, but make sure that you empty the tank of water completely (otherwise the bottom might fall out - water's always heavier than you expect!). Get help if you can, so you can get it all over with as quickly as possible, thus stressing the fish as little as possible.
I'm sure I've left some vital things out, but I can't think of anything else right now!