1 No need to LOS hurts you in most cases
2 Do not tank the priest but dps has to focus fire on it should be down in under 10 secs if mobs 4/5 or 9/10 use all your CDs if you need to in case heals need to heal dps
3 Healer and dps has to give you a few secs to gather them up if you cant stay alive for a few secs in the begining than you dont need to be there grab melee and head to the mage(hunter if no mage)
4 Taunt second ranged if you lose it 6/8 sec taunts should be enough to keep it off the healer
5 Pull melee mobs to secon ranged (make sure your backing up)
6 burn down second ranged EZ mode from here
7 if this doesnt work its probably not your fault i repeat its not your fault
I have a macro with this to spam and i havnt wiped in HOR last 10 or more runs
This assumes you no how to all the other basic tanking abilities
****EDIT*****
http://www.wowarmory.com/character-s...thul&n=roshney
my armory so you know i have a smal ammount of skill