Hi,
I am a HypnoBirthing teacher. I'm also a mum of four babies, 3 of whom were born using hypnosis/HypnoBirthing, plus I'm also a hypnotherapist and a doula.
As SM says HypnoBirthing is all about understanding the physiology of birth, the fight or flight response and what it does to the uterus, how adrenaline inhibitis oxytocin (as does neocortex stimulation - things like language, bright lights etc..so environment is also key), how it leads to reduced blood flow and a build up of lactic acid and all together how fear/anxiety/tension/bad environment leads to pain and "failure to progress". We teach you how to "self hypnotise" yourself (basically just very, very deep relaxation) and more importantly than that we help you condition the relaxation so on the day you don't have to "try" to do anything. We also help you to release negative associations with birth (and believe me, you will have some - we all do, even if we think we don't - that's the beauty of hypnosis and working with the subconscious mind!)
Most importantly we also get the dad on board, as SM said, you can talk to your partner until you're blue in the face, ask him to read a book/listen to a CD but IMO it just doesn't "go in" and his support/understanding and confidence on the day is vital - IMO you only get this full buy in from attending classes with him (and all men are sceptical to some degree at first! I've taught over 200 couples and I don't think I've had a man in my classes who has been raring to go and learn more initially!). For this reason I don't think listening to CDs is a patch on real life classes, also you don't get the inidividualise "fear release" hypnotherapy from a CD either - having said that though CDs are an option, just not the best IMO. If you get hold of an old copy of the HypnoBirthing book (orange cover with a baby on) it comes with a CD - the whole set costs about £15 (you need to read the book as well as listening to a CD - whichever one - IMO), also google "mindful mama" they make their own CDs which are v.good (they are also HypnoBirthing teachers).
The other option is to buy a book/CD and contact a local HypnoBirthing practitioner (see www.hypnobirthing.co.uk and see if they could see you for a one off "fear release" session and a short "birthing with hypnosis" workshop which your husband could also attend. I offer a workshop (using my own methods) for £75 which lasts 3hrs which couples use alongside self study and it usually has brilliant results, not quite as astounding as taking the whole course, but still good! Re. taking classes, you're not too late, I've recently started teaching someone who is 34wks and have started at 38wks before (she had a great birth!). Cost wise shop around, many practitioners offer discounts and payment plans and don't forget the new "health in pregnancy" grant gives you £190 you can put towards the cost!
With my first baby I didn't have a clue about any of this, did pregnancy yoga, listened to a relaxation CD and did NCT classes and had a horrible medicalised, hideously painful birth (with epidural/synto etc..), "failure to progress" and just horrible all round. With baby no.2 I saw a hypnotherapist (who retrospectively I realise knew nothing about hypnosis for birth! hence recommending you see a HypnoBirthing practitioner above!) and listened to a CD everyday, the birth was OK until I lost my state of relaxation and the pain hit me like a bus - I had to have an epidural. Baby's 3 and 4 were as a result of HypnoBirthing and wow - I can't tell you what a difference it made!! both amazingly easy, comfortable, calm, quick, no pain relief and no need for any!! if I could I'd give birth everyday they were such amazing experiences (you can read the stories here: www.birthfriendly.co.uk/about.htm - hence why I trained to teach it as it really did change my life!
HTH!