A previous poster said you can request checks, I didn't know this for my first, I was 8cm (and still on the induction ward) before they realised I was in labour, I was quite quiet... This changed for second DC when I asked for a check (and epidural if not too late - it was too late) but for me it helped massively as I felt listened too and in control.
In my experience, gas and air made me feel gloriously drunk. I really liked it, it didn't take the pain away but I didn't care about it if you see what I mean.
There are moments in both labours that I remember with absolute clarity 4/6 years on!
I didn't want to wear any clothes...
When my waters went it was like my whole body had a weird sort of rushing feeling for a second or two and then they popped. Maybe the pressure?? I appreciate it's probably not like that for everyone but it was a weird feeling that I still remember now. Like a blush but magnified! Also as PPs have said, I had loads of waters, it felt like it would never stop! Like I was weeing but couldn't stop it for DC2.
For me, when DC1 was born it was the weirdest 'emptying' feeling, like a very satisfying poo
but also slippery and bumpy like I had just given birth to a giant octopus. I think I may have still been high from g&a.
After birth of DC2 they gave me a pain killer suppository which was amazing. Never had pain relief quite so successful.
Also my midwife told me if I was able to chose, to pick a post natal bed by the window. She said it could help with jaundice. I was able to, and it was lovely for natural light as well.
For DC2 I packed food for birthing partner too. DH ate mine for DC1, I wasn't hungry but he was!
I hope this helps, good luck!