You are lucky to have a switched on man to guide you to the natural route. I would like to offer you one piece of advice (I just went through the miracle and trauma of childbirth - and it is both - so feel I want to help you in whatever way I can. Women need women at this time).
Buy two books - Birthing From Within (can't remember author), and Birth and Breastfeeding by Michel Odent. Ooh, and Water birth by Janet Balaskas.
I can honestly say that giving birth naturally and not clouding your clever body with drugs is a really good way to do it. There are immense, and tangible benefits to you and your baby by doing this. And you can do it, your body knows what to do, THIS is the normal path, not the wacky alternative. The drugs merely interrupt the very effective endorphin pathway and stop the push-stretch-push reflex. We have all forgotten in recent years that it only became fashionable to have a drugged birth since post-war America sold the concept to women as being more 'glam' and high-net worth individuals flocked to do it, the rest followed...
Breathe in through your nose, blow out through your mouth, count the outbreaths as you go, count backwards from 20 and I guarantee the contraction stops long before you get to 1. You don't have to do the WHOLE labour at once - childbirth is one contraction at a time, just breathe through that one... then rest again.
Giving birth with a strong dominant man beside you... now that is a piece of magic that will stay with you forever. I had my husband to lean on, used his physical strength to hang from, he kept me upright forward and open all the time and stayed strong when I was tired. I had an entirely normal natural birth at home in a birthing pool (which he jumped into fully clothed when we held our baby for the first time) and I can tell you from hearing my friends' co-erced, intervention-ridden and clinical production line experiences - this was definitely the better way to do it.
Yes be aware that you might have to change plan if things go wrong, but they won't. They do only rarely. People are so quick to say 'Ooh but what if something goes WRONG'. Imagine if everytime you said 'I'm just driving to the shops' someone said 'OOOHHHH but what if you CRASH???? I know someone who CRASHED' Sigh. Yes, you might, but let's not focus on it shall we!! Labour is one of the few times when the medics can see a dangerous situation coming in plenty of time to do something about it. It's not like a heart attack with a tiny window to make good. Focussing on what goes wrong is tantamount to expecting it. Trust your body. It knows what to do.
Anyway, there is gold dust in these books to tell you everything you need to naturally welcome his baby into the world. Right, I have blathered enough, I wish you all the very best and remember - it hurts, it's hard work, and you can do it. That's all you need.