i run up to the steps just before loken with my shaman team on follow and make note of how far my pally is from the team ( he will stay that distance from the team through out the fight )
I usually come in at a 4 oclock angle so that I'm not backing down any stairs when I back up.
I drop my totems and include a nature resistance totem in that group, if you need to include the 4x healing totems you can.
i'm usually out of range for the pally to pull so I have him run forward a little to pull and run back to the same spot he left the team from.
I have deadly boss mods so when I get the raid warning that he's going to blow, I back up about the size of one of the squares on the floor, 4 steps maybe, it's not that far.
I didn't survive the blow up when I just stood there because I only have about 14.5k health.
you could start a group heal as soon as you've stepped back just in case the team takes dmg.
my healer usualy does nothing ( no part time DPS ) so that if I ask for a heal on the tank or a group heal (chain heal on herself) I get one immediately.

my group heal or panic button is the numpad-5 where all shaman cast chain heal on themselves, if I tap it once usually only the healer is ready to cast ( the dps are already casting dps ) and I get a chain heal from her on herself ( but if more of them do the chain heal it's ok ) I top off the team this way for when they take dmg from other means.