I had a 3 day latent (irregular contractions) stage labour with a TENS and many, many episodes of HOUSE, followed by a water pool in the final 4 - 5 hours, and gas and air for the last 2 or so. It was fine - never hurt that badly, truly. I kept one step ahead of unbearable pain all the way through.
I'd bear in mind that a huge amount of labour is luck, so don't get wedded to any particular outcome except you and the baby being well. I tried to see it as a staircase of options, with nothing but distraction at the bottom, then TENS, visualisation, water, gas and air, pethidene, epidural. I was willing to go up a step as the pain became unendurable, but I didn't need to go any higher than the g & a. By the end I was sucking it without any cessation, though!
One thing that did really help was giving birth in a midwife-led, home from home environment, and even that was after spending most of the labour at home, eating, moving about, watching tv... and grumbling! I wanted to know that serious help and pain relief was available, because I knew that would stop me worrying and reduce the chances of my needing any, so I wanted to be in hospital, but I'm lucky and ours has an MLBU the floor below the standard labour ward. I went in to be checked over on day 2, and it was in the normal delivery unit, and I hated it. Bright lights, clinical, hard gurneys, just not at all relaxing. Atmosphere really mattered to me, which I'd never anticipated before being in labour - most especially lighting and privacy. I didn't feel vulnerable in the MLBU, and felt very in control; the moment my mother started bustling or the midwife took readings and needed me to surface from the pool I felt more pain. In the MLBU I was able to ask Mum to sit down and be quiet, and the mw didn't need to do any internals or anything intrusive, because she was one-to-one so could know how I/ds were doing by my breathing and temperature, and an underwater doppler for him.
I am really lucky, and had an easy and natural birth, albeit a long one. I think most women can, given half a chance. But if the baby is back to back, or you're just unlucky, don't see the drugs as your enemy - they're there as a backup if and when you need them, and you may not. I know TENS and gas and air do nothing for some people, and they need more. You might be lucky, and not need even that much!
Water was a godsend, though. I was in a fair bit of pain by the time I reached hospital, and my own bath at home was useless. The one in hospital was so huge I could float in it, and I did - and the pain went. It was extraordinary. Didn't need anything else for a good hour or two after that. The TENS really helped earlier on as well, though after 2 days it started to burn badly as it was in the same place, obviously, and the nerve endings there'd had enough of being shocked!