Here is my guide to healing Yor'sahj 10 Man Heroic as a holy priest. You have a few aces up your sleeve as a holy that are quite handy, as opposed to discipline, but I am sure this fight isn't too much trouble as discipline either. First of all you have the Lightwell for people to use during the mana void, also there is the stronger aoe healing during the aoe-damage phases, which can get quite intense. Overall I didn't much enjoy this fight as a healer, there are gaps of not much to do which I spent "helping" with the dps, and even the tougher parts of the fight weren't much of a challenge. Since I had just come from lots of wiping on Zon'ozz, a really challenging and fun fight to heal, I was somewhat disappointed by this. I think Hagara will prove to be more fun though.