making it easier on you and having time to do things
I multibox a 5 man setup running prot pally,druid tree heals and three elemental shaman for dps. I started my team using my prot pally as my tank at 80 and I had every piece of epic 5 man dungeon gear and some boe naxx 10/25 man stuff. I am also at 450 enchanting on that toon and have every enchant so I had all the best. Having this tank to take my 4 70s to 80 made it much easier and hassle free than trying to take a complete group of 70's to 80 in the instances. I had a lot of extra time to react to things because my pally can take such a beating. I've completed every 5 man heroic dungeon in wotlk many, many times and know all the encounters. YOu are trying to do AN on normal and are wiping with your team I would suggest that you save that one for later as it is very short but one of the most pain in the ass instances. The poison in there is ridiculous on heroic mode and yes you best blast that skirmisher immediately or you will die everytime! I have 12 totems and my team can pretty much heal itself and dps anything in any 5 man wotlk heroic. there are a few I havent completed due to the nature of the instance and having to ride vehicles basically. I'm glad I did what I did and started with an 80 tank. You have to be prepared to spend a lot of gold to make your life easier or be prepared to die all the time and waste it on repair bills.