M.A.
I prefer an out-of-hospital home birth with a midwife for my births, but I think it's wonderful that you want to experience childbirth naturally. I don't think you would have enough support at the hospital if you didn't have a doula, or a midwife instead of an OBGYN to show the hospital staff you are serious about having a natural birth. My sister is a nurse and she has told me that most nurses don't take people seriously when people say they want a natural birth, because most of them aren't completely committed and end up with an epidural. A doula is just a support person who will help you through labor and informs you of your rights in the hospital setting. If you have a doula you will be much more informed and not easily swayed if the hospital staff tries to convince you to get an epidural when you don't want one (this happened to me for my first birth, which was in the hospital). I tell all of my friends that are pregnant that even if they don't have the same opinion about natural birth that I do, I would recommend everyone that has a hospital birth, natural or not, to have a doula to support them. Very often in the hospital, your doctor isn't the one to deliver the baby, and you don't know your nurse. A doula is the only way to can guarantee to have someone you know and trust (other than your partner and/or family) in the hospital supporting you during this special time. Good luck with your birth!