I did a gentlebirth course which isn't available in the UK I don't think but I found a perfect mix for me. It covers hypnobirthing but as part of a toolbox of techniques available to you, and encourages you to think through what you might want in different scenarios. So: start with hypnobirthing, do you want a recording? Showers? Affirmations? at a certain point use water/tens/gas and air, if that's not working do you want pethidine, straight to epidural, etc etc.
I was induced, back to back, hyperstimulated by the pessary and basically screaming for pain relief for 12 hours which they couldn't give me as I wasn't dilated enough to be admitted to the labour ward. Once I was, I had an epidural which was magical, but the tens machine and my hypnobirthing recordings were basically what got me to that point.
I think that being as fit as you possibly can, listening and preparing to the cds but also being ready to just go with what happens is the best approach. The people I know with the easiest labours were incredibly fit, two went hiking at 8 months pregnant, one was very into yoga. I don't think it's a guarantee at all, but I think it helps. I also think any mental techniques that help you feel in control are good. But the main thing is not getting sucked into the mentality that there's a 'right' way to give birth. I do think sometimes births can be overmedicalised but that doesn't mean that no intervention is the way forward or possible for everyone.
But I've worked in developing countries and I'm fairly no bullshit about the fact that the answer to the whole 'of course women can give birth naturally with no intervention' is well actually no, in a minority of cases, it goes horribly wrong. Medical intervention is wonderful. On paper, almost everything that happened with my birth was the opposite to what I had wanted: I was induced, had an epidural so was on my back, had an assisted delivery and a third degree tear. In reality, from the point I got the epidural it was fine: I felt the midwives really listened to me, explained what was happening and why, and didn't feel at all bad the plan had to change.
I think give it a go, but try and make sure you don't start thinking it's the only way.