I had all three of mine with no pain meds whatsoever.
DS1 was a week overdue, and I let the doctor scare me into getting induced. Even with Pitocin and harder contractions, I did not use any pain meds. Did not want them, did not use them.
With DD, I was more educated and did not allow them to induce me, despite being a week past my due date. no pain meds, no need.
With DS2, I decided I really wanted the whole natural experience and had him in the water in a birthing center. Best of all my births!
My best piece of advice is to read some books on natural labor to help you. Knowing WHY you don't want to have an epidural, and truly understanding what is happening in your body, helps you to know that what is going on is happening for a reason (did that make sense?). I know that I personally liked to think of each surge/contraction as bringing me closer to my baby. I pictured what was happening, and knew that it was necessary to bring baby into the world.
My favorite books are: The Thinking Woman's Guide to a Better Birth by Henci Goer. Ina May's Guide to Childbirth by Ina May Gaskin. Natural Childbirth the Bradley Way by Susan McCutcheon.
The birth ball is your friend. Lying flat on your back is not! That's only helpful for the doctor. To truly allow baby's head to gradually stretch you like you need, gravity can help. Walk around, squat, all fours...all of this will help him come down. Go to the bathroom often. YOu need to keep urine flowing, and the squatting on the potty will help, too!
Remember what is going on with your body instead of just focusing on the pain. And something that I find to be the hardest thing, but the best thing for me, is to RELAX with each contraction...from my eyebrows to my toes. Tensing up with each serge really makes it hurt more, and relaxing, giving up control of your body and allowing your body to do what it needs to do, really helps everything move along better. Also, high pitched screams merely tighten you up when you need to open up. Try low pitched moans. Next time you go to the potty to tinkle, give it a try. Screech and see how it feels. THen moan in a low pitch and see how that feels. At this point in your pregnancy, I'm sure that you will feel more open as you moan if you're sitting on the potty.
Hiring a doula is a great way to help you with your natural birth. Also, refusing to be induced will help. If they want to induce you, ask what medical reason they think you have. Let your body go into labor naturally, and things will move along much better. You are more likely to need interventions when you allow that first one (induction).
Congrats and good luck! YOu CAN do this!