Just finished this quest last night. First, what a great quest. The reward is definately worth the effort. The RPG expert link below was a very helpful addition to the information here. My only regret was that I spent so much time farming a Blood Wolf Harness. (As specified in the RPG Expert walkthrough.)It wasn't used during the Wolf Tamer hand in. It was handed back, with the message that it wasn't needed. I read somewhere (could have been here) that turning in the gem twice is enough to get the harness of control - Well, it seemed to work for me, so I won't complain. I did the hand-in late last night, and I didn't even mention it to the zone. (There was only one other person in zone, and they were too low to solo Korf.)
For those who will attempt this with a faction mule - Getting to the room with the broodmother is fairly easy. Get SoW'd and inviso'd. I timed the movements of the mobs, so that I only had to pass one ancient shardwurm to get in, and then I ran directly between the two "guards" for the broodmother. All in all, pretty easy. I camped my mule there, still inviso to wait for when I was ready to do the quest. (Which ended up being just a little later last night.)
Edited, Wed Aug 24 16:29:10 2005