Pretty tough initally as a 62 demo lock.  But once I knew what to do, it was easy.  Brought out my felguard, dotted him up (immo, corrup, and CoA) and then just had my felguard tank.  I have improved health funnel so I basically just kept my felguard healed and tanking and refreshed the dots whenever they went out.  Took a while, but no real close calls.