I also think you should take the position. If it doesn't work out you'll have gained some valuable experience. There is a rather serious concern about your safety, however, that you need to deal with. I think you would feel more in control if you took some kind of self-defence training. Just in case. Oh, and good luck!

P.S. You listed in your cons your concerns about the increased responsibility. I think (since you were conscientious enough to list it) you'll do fine.