I absolutely felt that way at first. And like with your 16 y/o, you gradually come to trust her more and more as time goes by. That's what's happened to me as I learn where the AP works 100% of the time and where she needs more support. I can definitely relax more now than I could 2 months ago at inception. And I also have another 16 y/o coming through the ranks in the next 6 months. I think I'll be a better teacher now after having worked through AP (and a couple other daughters)!