To echo what a few others have said (and to caveat with every birth is different)….
your mental state is so so important. Fear is your biggest enemy here (makes your body tense up, the very last thing you want). It’s actually really good that you’ve posted this as you have time to address the Fear!!!
I’ve give birth twice. First time: found transition and active Labour terrifying, like i had lost all control. Gave in to fear, panicked. Screamed the place down asking husband to please shoot me. Stopped listening to my body / letting it do its own thing…. It was pretty horrible and yes I would’ve said painful
in the lead up to second birth I read the hypnobirthing book by Kathryn Greaves, practiced a little bit not loads. Had to be induced and it was covid times so was on my own for most of it. I stayed calm. I breathed and listened to my music and bounced on my ball. When it got more intense I had practiced thought patterns eg “this feeling will only last for a minute”, “this is one step closer to meeting my baby” “these sensations can’t be bigger than me because they are me” . And some visulisations. Was even falling asleep between contractions (leaning over high up bed head on a pillow). Asked for gas and air for one examination as I could tell I’d find it difficult to have it done during contractions and didn’t want to clam up. Was 7cm. Straight to delivery, in the pool, gas and air throughout. I honestly wouldn’t describe ANY part of that Labour as painful. Really and truly . And he was 9lbs 7. Intense, yes, powerful, yes, but then of course it’s going to take some powerful energy to get a baby out. It was all because of my state of mind and how calm I stayed. There’s no room for conscious thought, you need to be in the zone, listening to your body.
just my experiences and of course things don’t always go to plan but then I would say it’s even MORE important to have soon tools to stay calm. 100% recommend reading a hypnobirthing book or listening to a podcast, audio book or something. All the best OP!