I had a medicated-free natural birth in the hospital, largely in thanks to The Bradley Method. I recommend finding a class or at least buying the book "Husband Coached Childbirth" for your labor partner and you to read. The things that helped me most were
1) not going to the hospital too early. We walked in the mall for hours, went home for a quick change and some rest, and I was 7 cm dilated when I walked into the hospital. The mall kept me distracted and during contractions I would just lean onto and hug DH, swaying, breathing through it.
2) freedom of movement at the hospital. I was able to get into whatever position I wanted to despite the nurse doing constant fetal monitoring since I showed up at 7 cm. I leaned over the bed with my arms/head on pillows and then when I got into transition I was side-lying in the bed.
3) counter-pressure by my DH on my lower back and hips during the later contractions
4) hydration. They gave me a hep-lock just in case but I didn't need to be hooked up to an IV.
5) pushing with all your might even though it hurts. During the "ring of fire" sensation when DD was crowning it actually did help to push harder and it blanched some of the pain. I had a 2nd degree laceration but it was tolerable.
6) educate yourself about the risks/dangers associated with labor drugs and it will be motivation enough to stay away!!!!
Good luck! And even if you can't go naturally, don't beat yourself up. What is most important is that YOU and BABY are healthy and that you end up with a beautiful bundle afterwards.