thepositivebirthcompany.co.uk/digital-pack
Buy this, you've got time to watch all the videos. It's excellent and really interesting. I think the main thing that helped me was understanding what is happening in my body when I was in labour. The way contractions are actually the muscles around the uterus pulling up in preparation for then pushing out. It's fascinating stuff. Keeping active during labour, whether that's walking, sitting on a gym ball, or at the very least not lying flat on your back in a bed is important and so helpful.
My first labour started at 3am with my waters breaking. Contractions started around 11am. I pottered around at home, walking up and down the stairs, until around 4pm when we went to hospital. Got there to find I was fully dilated and baby was born at 5:10pm.
Second baby I knew from even before I was pregnant I wanted a homebirth. In the end my waters popped at 7pm, I spent a few hours bouncing on my gym ball and she was born at 2am on my sofa. Midwives came, and we were left alone by 5:30, just in time for my eldest to wake up as she'd slept through it all.
Also, tens machines are great. You can usually hire them from the maternity ward or even places like Boots. I had no pain relief in either of my labours except using a tens. The important thing is to get it on when you're in early labour as it needs time for the endorphins to build up.
Definitely look into the Positive Birth Company digital pack though. The most important thing about going into childbirth is a positive mind set and will help no end. Good luck!