I tried today and after 8 hours I finally manged to do it.. so happy and proud of myself that I kept trying until I got it.. Now I'm tired think I'll watch a movie before sleep, but thought I'd post here first because I'm curious if anyone tried and what strategy they used etc. So, anyone?
I used this strategy: http://www.youtube.com/watch?v=mOSMzW1byN8
Except after wiping for a few hours using turtle, I decided to switch to Arcturis (spirit beast). Specced deep into "Lick your wounds" and the heals (used on myself) somehow made a difference. (I loose some health on advisors in phase 3). Also had to res the pet once with heart of the phoenix, another amazing talent turtles don't have.
I made a lot of stupid mistakes like forgetting to loot/use the staff for like a million times

Ah well, I'm excited that I managed to do this. Mount didn't drop, but now I know i can farm it each week


edit: BTW my gear is ZA/ZG with some rep rewards - 353 item level.