I used to level a bit i HoS normal as well. I found that it worked best when I skipped the Brann event :P... But, if you insist on doing it, I found that it works best if you just line up in front of him, facing the small staircase. That way you'll be able to intercept alle the mobs before they reach him. As the event progresses, those faces will start to puke on you and you need to move your team back and forth out of the area of effect. If you do this and make sure you grab all the adds (I used consecration etc.) it should be doable (but not very good xp).

I think it'll be a nightmare in heroic, but I haven't gotten to that point yet - fortunately