Hi,
Congratulations x
After six babies the best advice I could give any mom to be is to go with the flow and have an open mind to any pain relief, if you need it use it ( its there to help you!) I found gas and air to help best as pethidine made me feel sick however find what works for you.
Your body was designed to deliver a baby successfully so you will instinctively move into the best positions or the midwife will offer advice on a comfy way to try.
When it comes time to push the instinct will override and you will need to push, let the midwife guide when to start to time it in with the contractions for best effect, just listen to them and they will guide you through delivery and look after you after.
I found that after delivery that all memory of the pain is obliterated by the love for baby.
Just trust yourself to be able to do it and get into a positive head space/ mindset as with anything we do, being positive about it is the first step to a positive outcome.
Try to focus on the big picture, to have a happy healthy baby delivered safely. If that means that plans change as they can so often do and you deliver with assistance or by a c- section then so be it.... Happy baby and happy mom x best wishes x