Turning off your XP
While not strictly necessary if you're only planning to twink temporarily, this is really important if you want to take your twinking seriously. If you accidentally ding, you're going to bump yourself out of your bracket, and there's no going back. To turn off your XP gains, visit Slahtz for the Horde and Behsten for the Alliance. They're located in Orgrimmar and Stormwind respectively, and will stop you earning XP. Don't worry, though, you can turn XP back on if you change your mind for a few gold. Another approach some might take is to simply not upgrade their account to the next expansion. Since Blizzard changed their character policy to allow players to play any race, not owning expansions beyond Wrath is less restrictive than it used to be, although the monk class will still be unavailable. Edit: Cynwise enlightened us that a recent change means you need XP on for arenas. Don't forget to switch it off again afterwards! Thanks Cynwise!