Hi L.,
My husband and I have been using NFP for 8 years. There are pros and cons, but due to religious and personal beliefs, I wouldn't do it any other way.
The most challenging part has to do with communication and getting a couple to be on the same page and both on board with the process. Once working together, I belive marriages are stronger for it.
I found that getting to know my cycles and body helped keep me in better health. When my fertility patterns were off, I would research it, and could usually link it to a vitamin deficiency or other health-related issue. I found a great book called "Fertility, Cycles and Nutrition" by Marilyn Shannon which showed links between diet, menstruation and fertility. It's a great resource. Also, there is software that comes with a book called the "Fertility Awareness Method" that is helpful in creating and maintaining charts.
I've had difficulty with charting and finding patterns while nursing. Using a charting method that requires taking your tempurature can also be challenging with young children not sleeping through the night. During these periods, I've had to rely most on other fertility symptoms or the use of a fertility monitor (Persona) once my period returned.
I am very glad to hear of information getting out there as to the negative impacts of birth control. As women, in general, we do not know our bodies and are too trusting that what a dr. prescribes is okay for us when there can be so many negative impacts we are never even aware of.
I'm not sure if this is the line of answer you were looking for, but if you have more specific questions, feel free to send me a message.
Good luck!