I have just geared up enough to run heroics, my healer is the worst off and had to carry some pvp gear in my bags to be able to queue.

I have tried a couple heroics but so far can only complete Lost City, I can do every boss in there.

I park all my toons except for the tank to the left of the door to the next area, then when the boss throws them they get stuck up high on the pillar, just turn them to face the boss and keep attacking, no longer worrying about the mines.