Yes it just takes a lot of practice and a lot of patience. The first time I went to Heroic HoS it took me something like 10 tries in a row to finally beat the encounter, and I still lost 2 shamans at the end. Its IMO the toughest MB encounter in the game (at least in 5 mans). For me there were 2 major issues. One was remembering to keep dropping new grounding totems - especially near the end when the lightning bolt guys kept spawning. Two was remembering to actually pull aggro on the guys coming in at the end when I was running around like a madman trying not to get hit by lasers. The mages especially would keep killing Brann, I had to remember to go pick them up before he died.

Once the phase starts where the big fire beam hits the ground, you really have to stay mobile. Once the fire beam drops you can stop wherever you're at, as long as its not hitting you, and start pulling aggro and downing some guys, but then you need to start running again. If the big fire beam hits you for more than a second or two your shamans will probably die.

Keep practicing, it will work eventually. As Dominian said you can check out my Heroic HoS video in the sticky thread at the top of this forum, to see how I ended up beating it.