If you're in the US, the main thing will be having a sympathetic doctor who is who is on the same page with you, and fully knows from the outset that you want a natural birth. Having the birth plan with and a doula are also helpful, even more so if you don't think your doctor is fully on board. And make sure that the nurses on duty are aware of your wishes. Since you still have some time, I would really do the research on the doctor and the hospital (some are fully on board with natural birth, others not so much)--find out what accomodations they have for natural birth, what the rates are for inductions and c-sections, etc. Mainly you need to be informed and be your own advocate.