I tried this quest with my level 6 Ranger.
The gist is you basically follow and protect Dwalin through an instance killing two goblins at each stop along the way. (Dwalin does a lot of the fighting himself.)
At the very end you have to kill a Goblin Shaman and another boss at the same time. The server was about to go down when I attempted this so I only had one shot at it. The boss went on Dwalin and the Goblin Shaman went on me. I assisted Dwalin and we killed the boss, but the Goblin Shaman hits hard and I was almost at 25% health when Dwalin came over to assist me and Dwalin was at 15% health. The Goblin Shaman killed me, then Dwalin, so I failed the quest, but I didn't try to use a trap to immobilize the Goblin Shaman. I will try this next time.