Just gonna be really honest here OP....
My first baby was back to back, although I didn't know until after she was born
. Yes it was horrendously painful, but everyone had told me labour was horrendous so I thought nothing of it, IYSWIM. I had a 10 'start to finish' labour, with 2.5 hours of pushing, which was very painful, although I did only use gas and air, and a TENS machine. I had SPD and previous sacrum/pelvis problems and so the pain that felt like my sacrum breaking in half I thought was just cos i had pelvic problems, so again, just got on with it...it was only when the MW told me afterwards that that pain was the babies spine rubbing down my own (ouch!) that it made sense!
I had no intervention, if by that you mean forceps or ventouse etc, and I had 3 stitches only.
DD2, born 2 years later, was NOT back to back, and slid out like a wet fish....easy peasy....
Good luck, I hope your baby turns, but if not, I hope it all goes well anyway. I can honestly say I didn't find me first labour that bad at the time, it was only when I had DD2, that I realised how much harder DD1 had been.