when is it appropriate to start trying to bring on labor?

I'm a FTM and know first babies usually stay inside the womb longer! I'm almost 35 weeks. When would it be acceptable to start nipple stimulating, eating pineapple...etc? Don't want to start too soon but I'm not dilated yet (that I know of) so...when is it ok to get the ball rolling? 
Ps- I think we ALL know about fetal development and when a baby's lungs are still developing. No need to be rude. 

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