Ok sounds good - no toddler to lift and good support around you :-) glad you're sorted for the injections too... have to admit I HATED those. It was alright when the nurses in the hospital did it, but I just never got the knack and it hurt a lot and I had MASSIVE bruises.
The main thing is having someone to pass babies to you, which it sounds like you do.
There's not much to prepare really. I found the trapped wind/first poo really bad - do ask for lactulose if you're very uncomfortable, I just wasn't ready for it to be that bad. They'll give you cocodamol/ibuprofen for afters so you don't need to pack any of your own.
Being snacks. I found I was starving hungry, especially with trying to express to feed twins. Really thirsty too, so have a big refillable bottle. Obviously you're null by mouth before and hospitals are hot, so you need to be ready for that. Comfy and cool clothes that don't touch your midriff e.g. nightie and dressing down. I found I was really quite swollen for several days (big contrast to vaginal delivery where i was pretty normal if rather saggy within 12 hours) so loose dresses were all that were tolerable. Flip flops - your feet may or may not swell.
Best of luck! I assume you're planning todelivery relatively early, so they will be very sleepy to start with. That makes feeding a bit tricky, but does give you time to recover.