There is one room in this quest that makes it impossible for one person to do it alone if they don't meet the requirements, granted they know nothing about the quest and didn't want to cheat it by looking at the wiki for the walkthrough.
Symbol of the Order of Daanvi, as it's mentioned in the wiki, has a prisoner in it that requires that you be lawful and answer some questions apparently. I went into the room by having my hireling flip the switch, who then immediately tried to follow me and ran into the prison field, slowly killing himself. I was locked in the room with no way to get out, because I was not lawful and he wouldn't speak to me. Even if my hireling didn't kill himself, there was no way for me to select the switch once I was in the room so I could have him turn it off to get out. This is also assuming that my hireling wouldn't magically reappear next to me inside because he couldn't find a route (that could be a problem, too).
I suppose the only option that I could see was to buy an alignment change from the store, but I don't know how that works, whether or not I had to log out, and whether or not I would even be in the quest or room anymore if I did.
Still, it would be nice if there was some way to back out of this in case you make a mistake like I did. Making the force field not cause damage would be one, because you have to know going in that your dumb hireling will try to follow you until he dies on it, which would require setting him to stay put or whatever (and there's no practical reason for why the cell should damage you anyway - that's stupid). Also, if there was a way to select the switch from inside the cell, that would work in conjunction with the previous suggestion. Currently, you can't, or at least I didn't find a way. I was forced to try something that ultimately didn't work (dying and running through the shield to see if I could make it to a res shrine - I found that I couldn't run through it) and then I found myself back at camp after releasing, and a long way from the quest.