Losing peace of mind: How to budget when seeking treatment abroad?

Hi everyone! I'm thinking about getting some procedure done in South Korea at the end of this month, but I'm honestly a bit nervous. I have just one question — how do you all plan the budget for this kind of trip? And how many days should I expect to stay? How did you calculate the costs for flights, accommodation, and the procedure itself?

Right now I'm not confident about anything. I've gathered some information from the internet and roughly organized it, but I might be missing something. For example, how many days will I need to rest after the procedure? I'm not sure exactly how many days that would be. I can't seem to feel confident about it.

If you've done this before, what advice would you give me? What mistakes did you make during the planning stage? How much time did you leave before getting the procedure done? I'm really curious — please share your experience!