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

Hello everyone, I'm Xinyi from Taiwan. I've been thinking about coming to Seoul for a treatment, but honestly, I'm a bit nervous. It's not just the cost of the treatment itself, but also flights, accommodation, food... just thinking about it makes my head spin a little. Can anyone share how you usually plan your entire trip?

I was wondering if setting aside about five to seven days would be safer? That way, there's enough time for recovery and it won't feel rushed. But honestly, I'm still not sure how to estimate the budget. Some procedures might require follow-up visits, which would make the itinerary more complicated, right? And I'm also unsure about which area would be most convenient to stay in. Should it be closer to the medical aesthetics district?

If anyone has had this experience before, I'd really love to hear how you planned it. Especially regarding any unexpected expenses or adjustments to the schedule... because I want to be thorough but also don't want to worry too much. Thank you, everyone!