hmmm addie81, goodness only knows who your friend had with her, but I can assure you it wouldn't have been a HypnoBirthing (Mongan method - trademarked) teacher - hypnotherapist maybe? and not a very good one at that, if he left your friend thinking he would "get her through it", he totally misunderstood the whole idea of hypnosis for birth and I can totally understand why it didn't work (having been on the receiving end of utterly useless "hypnosis for birth" sessions myself before I found proper trademarked HypnoBirthing!).
Gaelicsheep - actually no, far from it, most "bad births" are not due to a physical problem, they are due to various psychological effects such as subconscious anxieties, a belief birth is dangerous/hideous, memories, negative conditioning from society, unhelpful/unsupportive or nervous birth partners, medical intervention where not necessarily needed (e.g: induction for postdates) and environments not condusive to oxytocin release. Yes, true there are some real physical reasons of a "bad birth" but these are really (or should be) in the minority and if you really understand birth physiology and psychology you come to understand why it is so difficult for so many and why those who have good births aren't all "just lucky". HypnoBirthing is all about this, helping people to understand how and why it can be different and making it a thoroughly enjoyable experience for everybody.
However........HypnoBirthing is not magic, it is not something that "does or doesn't work on the day", it is about a whole new ethos, a new way of thinking, liberating old negative beliefs and replacing them with confidence and understanding. It is not something you must "do" on the day, certainly not for the mum. For most women their birth will be a calmer, more comfortable experience because of it. It does not promise pain free birth, it does not promise you will not need help to birth your baby, but it does help you feel more in control.
How the birth goes depends on what you put in in terms of practice (listening to CDs mostly), but also hugely relies on your birth partner (the best births are ones where the dad is entirely on board with it all - which is why it's really important for dads to go to classes), their understanding, their support and really importantly them enforcing your birth preferences on the day and guarding your environment. HypnoBirthing really helps dads to do this and as importantly as helping mums, it helps dads too.
There is not such thing as "a perfect HypnoBirth" and no such thing as "a failed HypnoBirth" either, the most perfect HypnoBirth I have ever had the honour to be at was a planned homebirth that ended up in hospital in an emergency C-Section. HypnoBirthing bought the parents an enormous sense of calm and control throughout their birth and that matters more than the stereotypical "no pain relief, no intervention, breathed the baby out in 8hrs start to finish with nothing more than a birth pool" (though I do see plenty of those too!).
So, as long as you don't see it as waving a magic wand to absolve you and you partner of lots of responsibility (and all pain), and rather a tremendous tool to help you to gain the calmest birth for you and your baby then I think you'd love it .