Hi op, I had a planned section for similar reasons. It was a wonderful experience and I have zero regrets!
Things I found helpful:
Still do yourself up a birth plan. There's actually quite a lot of 'small' things you can have a say in when you're having a section. For example I didn't want ds cleaned down before being given to me, I asked for a quieter room when he was coming out, I was able to bring in music to play in the background to distract myself (although I forgot it at the time). Your surgeon will obviously have final say on what they're willing to work with but it was nice to feel like I'd been able to have some say in it all too.
Music for background is really useful, I didn't realise that dh would only be brought in after I was already open, and then he and baby were brought out into recovery while they finished working on me so I wished I'd had it at that point because I was still quite nervous and it does feel weird! Not sore at all but weird! So I'd have a playlist on your phone and bring it in with you.
High waisted everything is your friend.
Loose button down nighties are really good because you'll need an injection every day so it gives easy access for that and checking your bleeding/ wound while you're in hospital.
Pillow for between your stomach and the car seat belt for the way home.
Peppermint tea or peppermint oil capsules for the wind.
A stool softener for that first bowel movement.
An extra long power cable for your phone. Or a power bank. Get your birth partner to set you up before they go home with what you'll need in easy reach. Blue tooth head phones so you can listen to music or watch things on your phone.
Snacks/sandwiches for after you've had baby. I had ds at 9.20am and was back on the ward at about 11am but wasn't fed again until 6pm because I'd missed the lunch order. I was ravenous.
If you are interested in breastfeeding and can harvest colostrum in my experience if was worth doing. Ds was very drowsy after being born and it was difficult to get him to feed so having a few syringes of colostrum to hand in a cool bag helped get him going again. It's not essential though.
Line someone up to be on hand for the first lot of weeks. Dh went back to work when I was 2wks pp and I pulled stitches trying to attach my car seat to the pram at one of our appointments. I wished I'd asked someone to come with me for things like that so I didn't need to do any of the lifting. Same goes for housework. Better to recover well once than do what I did and end up battling infections.
Similarly, air your wound as much as you possibly can once the plaster comes off. I had a slight overhang (doesn't really bother me id never had a flat stomach anyway) after but if your wound is essentially in a crease it can be harder for it to heal. Make sure it's really dry after washing (just literally run warm water over to wash) and then lie on your back making sure it's exposed for a while to ensure it's completely dry. Do that at intervals through the day - it helps with healing.
Take a multivitamin to build yourself back up and eat well. Do a bit of batch cooking to take the pressure off if you feel up to it so you have handy healthy food for lunches etc.
The best advice is really just try not to do too much, let yourself rest and recognise that your body has been through a major operation and you deserve time to recover. Bear that in mind when you're planning visitors and work them to suit you.
Space out your pain relief and if you don't feel like you need it, take it anyway. It's easier to keep on top of it regularly than to catch up when you've already got sore.
I agree with bringing your own pillow and ear plugs. The ward is so loud I didn't sleep at all. And having an extra pillow makes a big difference for holding your wee one because you can use it for arm support.
Have slippers and a dressing gown at the top of your bag on the day. You'll be given a gown for surgery (it will be see through and open at the back) and compression stockings which are slippy to walk in. You'll then need to walk round to the operation room like that so having those will save your modesty!
I looked up the operating theatre on my birth hospitals website in advance. There were lots of photos of the room itself so that helped me feel familiar with it so I knew what to expect on the day.
If you're interested in breastfeeding (no pressure if it's not for you) I'd identify a local support group so you've got that help lined up before baby comes. The help you get in hospital isn't always as good as it could be and I was put under a lot of pressure to offer formula due to how sleepy ds was.
Bring a separate bag for baby as you'll need the midwives/ nurses to help you with changing and lifting baby initially before you can feel your legs!
You'll not be discharged until you've peed a certain amount in one go 3 times. So bring a bottle of water that you can refill and drink lots and try not to do lots of small pees so you can meet the target for discharge if that makes sense!
Congrats op, I hope it all goes well for you! Enjoy the baby bubble!