Can someone expand on the technique to survive the archers getting to the first boss, please?

I am running a protection paladin, discipline priest, arcane mage, affliction warlock and beast master hunter. The best I was able to do was park the group near one target and use the hunter to grab a target and move forward. Between shield, penance and a health stone, I can mostly get to the archers and eat the stun. If I am careful in the priest's placement, the hunter can get healed most of the trip.

Do you use click to move to move the characters who are not directly behind the target?

I tried having all but the priest /follow the hunter, but then they died to the fire. Leaving them back with the priest seemed best, until it was time to pull them forward with a group follow command via ISBoxer.