I used the Marie mongan method. I wasn't that convinced at first to be honest, the book was interesting but not all the techniques suited me so I took what I liked and left what I didn't. I listened to the cd regularly from 25wks or so but I always ended falling asleep on it so I wasn't sure it would actually help.
On D day I ended having very gentle contractions in the middle of the night, which got stronger in the early morning but frankly nothing that bad. I had a bath, got my breakfast, got ready, including make up - I knew I was in labour but in my head it was going to take ages, quite possibly several days.
At 9am I was on the phone to my midwife and we were having a chat like we were in the street or something, I wasn't panting in agony or anything. We agreed I was probably going to give birth today but that although my contractions were close together, I should wait until they were longer (1min) to go to hospital.
Around 9.20am, the contractions got stronger and it was much harder for me to ride them out and focus on my breathing. Shortly after, I was sitting on the loo, trying to pee, feeling groggy and angry that I wasnt coping better. I was such a fool to even entertain the idea that hypnobirthing could work, I was probably 3cm and would be screaming for an epidural ins couple of hours. What an idiot.
Turns out I was transitioning... My waters broke and 5min later he was out! Thank god DH was there to catch him.
I had no idea I was so far gone as I coped really well up until the transition. With hindsight I think that my contractions were longer than I thought when I talked to the MW but because I was so in my thing I didn't realise. As for the pushing, I literally didn't nothing. I was completely in my bubble, I got onto all fours without even thinking and I let my body push him out. It didn't hurt, all I felt was immense pressure. He was out in 2 pushes so it happened very quickly but I didn't tear.
So I'd say, give it a go. The worst thing that can happen is that it doesn't work and that you end up having all the drugs on the planet - it doesn't matter, you'll still have a lovely baby.
Good luck!