No offense to OP, but tanking the primal fights is a bit of a different story than healing or being DD. My main is WHM but I just recently leveled my PLD to 50. I went and started tanking primals and it was stupidly easy. I'm not saying you don't need skill, but the only time I've seen a tank go down in a primal fight is when my other healer or myself has screwed up.