This is going to be my third baby, and whilst it is quite a long time since I had my others, this is what got me through
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remembering that childbirth is not a medical complication, it is a completely natural process. Your body KNOWS how to give birth, just like it knows how to breathe and digest food.
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keeping very active during the labour, moving about, using birthing balls etc
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having a detailed birth plan for the "best case" scenario, i.e. an uncomplicated, natural delivery
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understanding that at ANY stage you can ask why midwives are suggesting things, and that it is your right not to have any intervention until you fully understand why it is being suggested, and what the implications may be
I used aromatherapy massage oils in both my previous labours, which really helped with relaxation, and also made me feel that it was less of a medical event, if you understand what I mean. I also took my own music along which helped a lot.
DS was a natural labour and normal delivery - for pain relief I used water, TENS and tried gas and air but it made me sick. I had a shot of diamorphine near the end but that was nasty stuff. I spent very little time on the bed! DD was induced a few weeks early because I had kidney problems, but the actual delivery was completely normal and I actually delivered her myself from an all fours position which was utterly amazing 
I'd like a home birth this time, no idea if that will be possible, but if not, I will be taking my own pillows along with me to the hospital, along with aromatherapy oils (lavender and clary sage are great for during labour), music, and I'm going to make a birth labyrinth picture to have with me too.
Finally, with both my children, I had a close female friend with me present (as well as my exH) during the labour and birth. Certainly helped me to have a friendly female presence, and also alleviated the pressure on my H. This time I'll have my doula and a good friend with me. That might be something to consider.