I have seen a lot of badly designed quests in all the time I've played this game. But I think this is the first real utter garbage I've seen.
I did this on a rogue and what a complete mess. The sword and worthless idiot Kleia pulled me out of stealth I don't know how many times. I don't know what the garbage quest designers were thinking, maybe they thought the sword was more powerful than it was. Or maybe they just don't think.
I honestly can't imagine doing this on a class that can't stealth. I don't know how many times I died or how much stygia I lost.
And of course I had to also have my Eye of the Jailer issues too, since you'll be questing in here (more proof these designers don't think).
The only advice I could give is try and do it at a time where people are doing other quests in here and hope they can clear some of the area out. And hunt further in back and try and find the Forsworn to rescue that don't have 5 mobs standing around them.
Honestly, this quest is complete garbage.
edit: I have done this terrible quest on several toons now. I've found one thing that helps, look for the weapon racks and get the weapons on them [spell=346048] [spell=346097] (just an example, there may be more types). You can get multiple types and they actually do damage or heal you. So, ironically, get the weapons from the weapons rack and they will help (unlike the sword that's following you around for this quest).