pain relief has been around for ages, asprin comes from tree bark for instance so people used to chew it. but thanks to evolution of medicine we dont have to worry so much about it. ancient egyptians are documented to have done open heart surgery and many cultures have cut open holes in peoples skulls to relieve pressure to cure certain 'aliments'. quite frankly, if i dont have to be awake and feeling heart surgery than i dont want to be, same with labor.
my first pregnancy i felt labour right away, the second pregnancy i didnt feel any contractions until i was 7 cm dialated, then it snowballed. i live in a rural community and it was on a weekend so i had to get shipped to another hospital 3 hours away by ambulance while in full labour, on bumpy highways while it was snowing.... omg... it was horrible... kindof like what a wish bone feels like i would think. but every labour is different, some women dont feel too much of anything. just keep in mind that it will end and you will forget alot of it. and be prepared because some women poop when they give birth, i didnt but i have met 2 that have, so maybe dont film it... up to you though.