One of the most important things if you want a natural delivery is to stay active... keep doing light exercise throughout your pregnancy so you maintain a healthy appetite, but don't gain too much excess weight and most importantly so your muscles stay strong enough and your stamina high enough to deliver your baby. A lot of people end up having a c-section after a long labor (or after becoming completely exhausted) because they have been sitting around doing nothing for 6 months. Remember pregnancy is not a disease, you are not ill or disabled. We still went for long walks around the hills of cameron highlands when i was 8months pregnant on our babymoon. Of course don't sudenly start running marathons when you are pregnant if you haven't been doing so before, but maintaining your regular level of exercise throughout most of your pregnancy is very very healthy (unless you are a competetive weightlifter lol, then better stop).

Setting up a birth preferences list (Birth plan) is a good way of making sure your wishes are met by the doctor nursing staff on call. In your birth preferences you can list under exactly what circumstances you would be willing to have a c-section as well as anything else you prefer. By discussing your birth preferences with your gyne early on, you get a good idea of whether he/she is suitable for you. Also make sure to tell the nurse on call that you have a birth preference list and give her a copy when you check in, during my deliverly the nurse tried to keep me strapped to a monitor making it impossible for me to move around as she was unaware that i ha a birth prefereces list in my file until i told her.

Also remember to include your husband in your birth preferences list, make sure he agrees with your choices and can help stay on 'your side' if the doctor or nurses are trying to push you to do something you don't want to do. At the end of the day it is your birth and only you can know how your body is feeling.

When my son was a week away from his due date my doctor (despite signing my birth preferences stating i would only have a c-section in the case of fetal distress) wanted to book me in for a c-section on my due date which i refused. He tried to pressure me into it a little but there was no medical reason for c-sec so he had to respect my wishes. You can safely wait up to 2 weeks after your due date as long as your baby isn't huge or any complications arise.
My son was born naturally just over a week after he was due. He was out so quickly the doctor almost missed it and i had to wait for him as he came running down the corridor lol.

As long as you have a good doctor that you trust and like, and insist on c-sec as a last resort both in your birth preferences and when the conversation happens you should be able to deliver naturally with most doctors (assuming there are no complications, make sure to do your own research on what can go wrong and what options you have well before your due date, discuss them with your husband and choose what procedures you are comfortable with and which are last resorts so you are well prepared to make any necessary decisions on the day).