First time getting treatments in Korea, how should I plan my budget and itinerary?

Hi everyone, I'm Tzuyu from Taiwan. I've been thinking about coming to Korea for a treatment recently, but honestly, I'm a bit worried about the overall cost and time commitment. I've never done anything like this abroad before, so I'm not sure how to start planning.

Mainly, I'm unsure about the total duration of the trip. How much time and money would be needed for round-trip flights, accommodation, and the recovery period for the treatment itself? I've heard some treatments require multiple follow-up visits, and some might need a few days of rest post-procedure. But my work is quite demanding, making it difficult to take too much time off at once. Has anyone been in a similar situation and can share how long is generally a reasonable amount of time to prepare for?

Also, I'd like to ask how you usually estimate your budget. Besides the treatment cost, flights, hotels, and meals add up significantly. I don't want to be surprised by unexpected expenses, but I also don't want to underestimate and be unable to go. Can anyone with experience share how they planned their entire trip? Any advice would be greatly appreciated!