What are the most common regrets people experience after undergoing plastic surgery, and how do these regrets differ depending on the type of procedure, the patient’s expectations, recovery experience, emotional readiness, and long-term results? Additionally, what factors such as choosing an inexperienced surgeon, unrealistic cosmetic goals, complications, scarring, dissatisfaction with appearance changes, or psychological impact tend to contribute most to post-surgery regret, and how can patients reduce the chances of feeling unhappy with their results?