Had an emergency c-s after being in labour for 37 hours, so all came as a bit of a shock. Make sure you've packed loads of baby stuff - we weren't expecting a stay in hospital and ran out of clean baby clothes and nappies at one point.
Totally agree about the big knickers and I'd go for big nighties rather than pj's, as I found it difficult to bend down.
Even if you're not planning on using baby wipes with your baby, take some for yourself. Wards are very hot and you might find you sweat a lot after the delivery - it's your body getting rid of the excess fluid. I found these great for freshening up.
HFM - I wasn't allowed out of bed for about 20 hours post op, so couldn't change dd. However, m/ws were excellent, told me to buzz whenever she needed changing or feeding and they sorted us out.
Don't expect to be up and running around 5mins after, although I would say get up and mobile as soon as you can. I'm sure it encourages healing and it'll make you feel better. Not wanting to worry anyone, but being completely truthful, it took about 16 weeks until I really felt (physically) recovered. Know your limits and don't over do it.
Best of luck.