I have not seen anyone post here for a long time. I am Mary, I have used
NFP, mostly just the Billings method (mucus only) to follow my cycle for
over 15 years. There were no suprises. It is helpful to take a class when
you a starting out. It will help give you confidence and you will have
someone to discuss your questions with. You might ask your library might
ask your library to get "The Art of Natural Family Planning" for you,
that was the book I used to teach myself. Many people like "Taking Charch
of Your own Fertility". I have not read it, but it does has pictures of
mucus at different stages of your cycle. So you might want to ask for
that one too. One advantage of NFP is a much lower divorce rate for
couples who use it.