http://www.youtube.com/watch?v=K3TkBcVQZhI This shows the Dreadsteed quest being done by me for a friend's warlock.
I myself did it for my 3xwarlock/mage/priest group at 60 with the assistance of a level 70 warlock friend, so no tank besides the felguards.

Recently, I used my tankadin, priest one mage and one warlock to get the quest done for someone else, and that worked even better.
Don't do anything in the ritual besides attacking the felguard type things, when a node goes down, pop consecration and fix the node. The End.