First I am sorry you have to have the csection at this stage, but know that it's great that you have time for the mag and steroids!
I was on HBR for 9 weeks and had my lo at 32w6d. Even with 3 doses of steroids (2 at 24w, a rescue at 32w) he had to be intubated but only for 2 days, was on cpap for a few days, then just nasal cannula. Once she comes out things will go very fast, they will give her to the neonatal team and determine what she needs, this part is very scary and we were not prepared for it. Just know that they are going to take good care of your little girl, my dh wasn't allowed to go with ds at first which was terrifying but he was in extremley good hands. Ask tons of questions before and after, the nurses are so smart and are great resources.
As far as survival tips, make sure you get your rest! It's going to be so hard because you will want to be with your little one and see her as much as possible but you are about to have major surgery. You need to heal, every nurse told me that and I didn't listen. I ended up getting sick and had to stay home a few days which killed me!
Good luck tomorrow, keep us updated when you can!