Well, completed this 5 times tonight (first attempts ever).

1 tanking trinket, 1 caster trinket and 3 dps trinkets.

It was really easy. My son was on his holy pally and just picked up the adds while the tank and dps blew the boss away.
Will go back again till all the shamans have the caster trinket and my son has a tanking trinket for his pally.

Takes longer to get there than it does to complete 5 times