
Step One: Get the Hysteria Buff from a player with Dark Thoughts (the Dreadlord thingy from the invasion event). This lets you attack friendly players and npcs. It only lasts 10 seconds so you have to be quick!
Step Two: Get a summon to the Isle of Thunder. I used my Warlock, my recruit a friend account lowbie and my Priest friend to summon myself there.
Step Three: Quickly tame one of the Direhorns before the buff runs out.
This all came from a random idea I had while playing the beta, and I'm glad it worked.

Edit: Also worth mentioning you get a 30 minute debuff after you get the Hysteria buff put on you that makes you immune to another use of it. The debuff can be removed by dying. Also fixed the spelling mistake in the subject. Oops!
Edit: Apparently the Hysteria Buff was hotfixed to no longer work outside SW/Org
