I'm practicing NFP for more than two years now. For me it works great. (Wich means i'm not pregnant ;-) )
In addition to your pros i have those:
- you'll know when your period will come
- you can find out if you have any hormonal problems
I started with it because of the sideeffects of hormonal birth control. After stopping the pill, my cycles were very irregular. (6-12 weeks) This does not effect the safety if you practice the method correctly. About 1,5 years later my cycle is quite regular now.
I think you only need a few things to practice NFP: some time to learn the method, patience with your body and a non-hormonal birth-control-method for the fertile time.
The book in your link seems to be good as far as i remember it from a german online-community.
In addition to your pros i have those:
- you'll know when your period will come
- you can find out if you have any hormonal problems
I started with it because of the sideeffects of hormonal birth control. After stopping the pill, my cycles were very irregular. (6-12 weeks) This does not effect the safety if you practice the method correctly. About 1,5 years later my cycle is quite regular now.
I think you only need a few things to practice NFP: some time to learn the method, patience with your body and a non-hormonal birth-control-method for the fertile time.
The book in your link seems to be good as far as i remember it from a german online-community.