DD (em c/s) was 22months when DS (el c/s after VBAC plans went out the window...) was born.
My recovery from the em c/s was pretty good, quite a bit harder this time, but I think that was mainly due to the severe PPH I had, rather than the actual c/s.
It is hard work looking after a toddler & baby post section, but I managed it without extra help. DH went back to work after 2 weeks & he works away Mon am to Fri pm & we have no family close, so I was pretty much on my own.
In a way I was "lucky" to have quite bad SPD at the end of my pregnancy, so I couldn't really pick DD up anyway, so she was used to it. I'd definitely start making any changes in routine well before the baby is born, so the baby doesn;t get the "blame". For example I used to bath DD every night, but I changed to only bathing her once when DH was away in hte last few wks of pregnancy & then not at all for first couple of weeks whe DH went back to work (wks 2-4 post c/s) - she survived
I used kitchen steps to help her climb in & out of her high chair, she thought it was a great game!
You end up doing a lot more things like sitting reading etc & watching a bit more CBeebies than you might like, but it's only for a short time in the grand scheme of things.