Question about turning in Gnoll Fangs in Halas

[Bardolap]

Without saying exactly how bad of a noob mistake I made, let's just say that I need to increase my faction standing with several Halas groups. Specifically, I took a few negative hits to MerchantsofHalas, ShamenofJustice, SteelWarriors, and WolvesoftheNorth. I wound up being KOS to several mobs that I need to be around and I'm not at all welcomed in Halas. After killing Giz Dinree about 50 times in East Freeport (this only affected WolvesoftheNorth), I decided to go back to Halas to see if I can get in. I found that I'm viewed "Threateningly" by the guards and merchants. My understanding is that I'll still be attacked if I hang around agro range too long.

I understand that the gnoll fangs can be turned in to help all of these factions. My question is how I can get there without being killed. If I invis myself and get to the turn-in NPC, won't they still attack me once I turn in the first set of gnoll fangs? I read somewhere that you have can do the quest at "threateningly".

Any advice on exactly how I should go about this? Or any other advice on how to work on those factions without going into Halas?