Let’s give this another shot

Second time trying to self induce at 40 weeks. I prefer to do nipple stimulation but last time all o got was back pain. By the way, I’m aware this may not work and that baby will most likely come when they want. I’m trying to avoid being induced medically so if it’s not gonna hurt me or my baby I’m open to trying. Tell me your tips with self inducing especially nipple stimulation. My doctor has given me the okay to try whatever and has told me what to stay away from, due to not wanting to have any kind of medicine in me.