How to heal as a priest in any situation:
Is Prayer of Mending off CD?
Yes? Cast Prayer of Mending.
No? Twiddle thumbs. Look around and see if there is something fun to cast on someone so they think you are paying attention. Try Renew! Yeah...
Oh good, PoM is off CD ...


It's kinda funny but true. With the right build and the T9 set bonus PoM does most of the work for me in most situations on my priest. If I'm falling beind in healing it's only because I was forgetful about rule #1: Cast PoM... then cast it again