we can only take guesses but one can assume: chemicals, hours involved, and the number of surgeons I believe he said was 100+ one of which being Ren Xiaoping.
other operations as such after the fact i'm uncertain if a caretaker will be provided, but that would inquire them to know nearly as much as Zen or Canavero would about the effects of the surgery.
perhaps he is also imploring all previous works such as the transplants done on the lab rats that didn't survive very long.this.
on the contrary it has also been mentioned that the reduced rate would be |13Mil$ 13Mil$| instead of 100Mil$.
postscript a lot of people say that the surgery will be a minimum of 13mil$ but don't give a reason as to why, this is because Ren Xiaoping and Sergio Canavero have given little to no information on how this surgery actually works,
and until someone on the surgery team actually gives us a better idea of what goes on during a head transplant which they have not we can only make estimations on why it costs so much and can't actually pull proper figures.