actually the difference from normal to heroic isnt that much different. Once you have your strats down you have the hard part done. I would say the hardest part of this dungeon is the nature immune mobs and getting them killed on heroic without your tank dying (and you wiping.) The last boss was thought to be really hard, but I just timed my chain heals for 1 sec before he cast his AE (he has a cast bar) and stacked them on top of tank. Now if you dont have enough health on your slaves to survive the AE, well then this will be a hard instance