Natural Family Planning

With babies being so close to being due , it’s time to start thinking about birth control or other preventative measures lol . I was wondering if any of you had any success with natural family planning as a birth control method and if so....any tips ? I was on birth control for 5 years before baby number 1 (the shot for 1 year and a low dosage pill the other 4) and looking back now the cons outweigh the pros and I would like to avoid going back on if I can . I’m also not a fan of IUD’s from stories I’ve heard so hoping to stay away from those as well . With my first I breastfed for 16 months and shortly after her first birthday (when she started to feed less and less) I got pregnant , I’m hoping to avoid that this time around lol . All tips and suggestions welcomed , thanks in advance .