The focus of my comments has not been on the methods' ease of use. I did write "easy to learn", and I think the research backs up that claim.
I am aware of what is involved in tracking the various signs. Like most any voluntary human routine – exercise, special diet, regular study, etc. – the hardest part is in the beginning, i.e. making the commitment, getting in the habit, sticking to it. How difficult or easy it is to adopt an NFP tracking-routine is going to vary by the woman/couple. If for some women basal temperature and cervical mucus are perceived or prove to be difficult signs to track, for whatever reason, they could look into the Standard Days Method (linked above). Some may prefer that method in the first place.
I am aware of what is involved in tracking the various signs. Like most any voluntary human routine – exercise, special diet, regular study, etc. – the hardest part is in the beginning, i.e. making the commitment, getting in the habit, sticking to it. How difficult or easy it is to adopt an NFP tracking-routine is going to vary by the woman/couple. If for some women basal temperature and cervical mucus are perceived or prove to be difficult signs to track, for whatever reason, they could look into the Standard Days Method (linked above). Some may prefer that method in the first place.