Hi first of all do take comfort and confidence from the fact that second births are very often quicker and more straightforward since you have done it before and you will understand what's happening to your body much better, even though your first experience wasn't quite as you'd hoped.
I've had 3 babies and thoroughly recommend JuJu Sundin's book 'Birth Skills: proven pain management techniques for labour and birth' I found reading this book and putting the techniques into practice really helped me feel in control and gave me confidence that I could achieve a straightforward vaginal birth without interventions or drugs. All 3 births were positive experiences, hard work and painful yes - but still positive. Get your DH to read it too. It's available on Amazon.
I never tried hypnobirthing so can't comment but I know many women swear by it. The JuJu techniques are mostly very practical, simple and therefore easy to focus on when you're in pain. Mostly they're about distraction.
I also used a TENS all 3 times and would not contemplate birth without one, not everyone gets on with it but might be worth a try, you can hire them for around £25, try Boots. You can't use them in a pool though, obviously, but might still help in the earlier stages.
Drink gallons of raspberry leaf tea in the last 4-5 weeks before your due date, it's meant to make contractions more effective (not bring labour on as some say), an old wives tale but I feel it worked for me.
Some stories on OBEM are so inspiring and positive, you might like to select just the ones that you feel will help give you confidence and watch them on their website. Last night there was a woman, Sarah I think, who gave birth without drugs in the 'active birth' room having had a tough time first time around. She was amazing, though her partner was a bit useless!
Best wishes, remember a straightforward birth is normal not lucky, you can do it.