Aishes Chayil, I hear what your saying, bt I said above:
I was doing it, (with a little peeking here and there, but then I’d stop myself) until Rosh HaShana came. During davening, my fingers starting bothering me and my hand started going to my mouth. I kept on pushing myself back, but my fingers were rreally bothering me. (I can not explain this “bothering”. It is very weird…) I think I even got a piece of nail off on R”H R”L.
THAT was Rosh HaShana! There is something in biting nails, that once you start, you NEED to contine.