Giving Birth

Is anyone else incredibly nervous about when "The Time" comes? I feel like I'm fine being pregnant and that it will be nice afterwards but the actual act of birthing has me terrified! Is it going to be quick- will it take forever? How much pain will I be in? Will everything go smoothly? I'm having a natural birth because I'm keeping things drug and chemical free but now I just don't know. I had a nightmare of the pain and there's just so many possibilities as to how it could go!