All I can tell you is my own story about giving birth to my son who was 2 past July. I had been diagnosed with RRMS for 7 years when I delivered. My medical team were fantastic, saying we shouldn’t rule anything out before the event, but just make a few options of plans! After long chats, I didn’t consider the elective c-section option because the medics were confident I could deliver naturally. I ended up being induced, because i had high Bp, so only ran 1 week over. (Brilliant, by the way!!) I had a bath when contractions started (10pm), and used a TENS machine (in bed, not bath!), still swithering over having an epidural or just sticking with gas & air. Originally, I told my team to let me know when the latest time would be, whilst in labour, that I could choose to have the epidural - after having chats with the anaesthetist some weeks previously to check it would be ok. But contractions hurt (!) so whilst in the bath I suddenly made my mind up to go for the epidural, and told the team in the morning (9am). I made sure they gave me an epidural that would still allow me to be mobile (as discussed with anaesthetist), and they did, and it worked out amazingly well for me. Gas and air had no effect on me other than completely spacing me out; with the epidural, I could still feel sensations but no pain, so still could feel when i needed to push (3pm-4.24pm exactly!!). For me, recovery from the epidural and birth was fortuitously quick and straightforward - i’m very lucky. No relapses till the December - even then it only lasted 2 weeks with a course of steroids.
Main point is, you WILL know what is best for you, when the time comes - i don’t know, it’s like mothers instinct or something. Don’t say yes or no to anything until you will get that ‘flashbulb’ moment of knowing what to do, like me in the bath with my contractions. Your body will tell you, because it wants to protect you and the baby.
Good luck, and enjoy it - it really is an amazing experience.