As a guideline (I'm sure this will be disagreed with), try to assemble a tank, an offtank, 2 clerics, 1-2 backup healers, an enchanter...and 5-6 dps including 1x 50+ rogue to open the doors and a monk for pulls
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The more you have, the easier it'll be. I'm on a lengthy break from blue or I'd help
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