holy wrath for the win. just make sure your behind the warriors so they get the initial "body pull agro". This way the necro's wont agro on you for the spell damage.
Cast a holy wrath and pull your bunch to the side. If you have aboms pop a free action potion and call out in vent if you have more than 2 for someone to take one off you. the 30 seconds with no knockdowns is more than enough time for a warrior to taunt an extra one off or a pali to fear one. Then just go to town.
I always suggest judging and re-sealing light. You'll have so many mobs on you that your "sor threat" on 1 mob is not needed. I have found that the extra healing from J/SoL to be very nice added healing(Seal of light heals me for an extra 90k hp on the average hyjal clear).
Just be sure to be vocal if you have too many on you and need something pulled off. Chances are your casters will be aoe-happy on top of you.. if you die, they all follow.
Oh. And grab a stack of nightmare vine & Ironskin pots... dont be cheap. Hyjal is the best place to show our worth to a raid and you'll find yourself tanking much more regularly if you perform well here.
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Official tankadin of <The Core> Tichondrius
Old FFXI signatures are FTW. Miss my hot mithra