Be aware that there is a window of opportunity, dilation wise, in which an epidural canula can be inserted. Once you have dilated beyond the specific number of CMs then you cannot have the canula inserted no matter how much you beg.
The best course is to have the canula inserted in your back while you are within the 'window' and then you have the choice to have the epidural drip slotted into the canula if you decide you could use the relief. Sometimes staff for reasons of their own will ask you to defer having the canula in and will try to soft talk you into waiting and seeing how things are going before deciding on pain relief. If you listen to them you run the risk of being told 'Too late' when you decide you want an epidural.
If you end up having an emergency CS they can use the canula in situ to numb you locally for the operation while you remain conscious. Maybe better than being TKO.
I can't remember the CM limit for getting the hardware in situ. I'm sure it's online somewhere.
I do agree you can overdo the birth planning. Birth is going to take its own course. A partner needs to not be annoying or self absorbed, lend a hand to squeeze, and to make encouraging noises. If medical intervention is needed then you really don't have the choice to refuse or to get up and take your business elsewhere.
What you need to do is sit down and look at 'worst case scenarios' together --
CS needed -- will DH stay for the op?
Blood pressure issues, baby in distress, labour stalling -- will you have a CS or will they allow labour with intensive monitoring? DH may need to ask about options.
Baby taken to NICU and you are being stitched up -- does DH go to NICU?
One thing your DH needs to be completely on top of is transport and parking.
He needs to make sure there is at least half a tank of petrol in the car at all times coming up to delivery.
He needs to anticipate any traffic problems there may be on the route to the hospital in the period from 38 weeks to 42 weeks and if there is going to be any major roadwork, any event like a concert, game, etc that could result in massive delays, then he needs to plan a few alternative routes.
He needs to find out if the hospital does valet parking or if you can be dropped off at the emergency entrance while he goes and parks, and if so how will he find you after they whisk you away.
He needs to find out if there is any priority parking for maternity patients, or if you will end up going round and around a carpark looking for a spot while you get closer and closer to delivery.
He needs to know whether there are metres to feed, etc or if he can get a waiver.
He needs not to lose the parking token or his keys.
He needs to figure out how close he can get the car to the exit for when you are getting home.
I say this because I once shared a room post natally with a woman whose husband wasn't aware there was valet parking for emergencies and they went into the huge carpark instead. By the time they found a spot the woman wasn't able to walk and the hospital had to send a stretcher party into the carpark to look for them.