I'm worried about the contour of my chin and whether I should advance it...

This week, I was scheduled for square jaw + chin advancement surgery at ㄱㄹㅎ, and
 there seemed to be a lot of reviews of people regretting the chin tip advancement after doing it..
 I have neither a square chin nor a flat chin, and my chin is slightly wide horizontally, but
 my mouth is a little protruding, so if I advance it just a little bit, it will make the side look better. You say the front line will be pretty, but
 is there an example of moving the chin forward? I guess I'll be wondering until the day of surgery
 whether I should just have a square jaw or whether I should trust the doctor's advice and advance the tip of my chin
 ...
Also, is there any experience of having surgery on a slim person?
 I chose this place because they said it was natural and safe, but
 I'm worried because there are some reviews saying that the tip of the chin is too sharp.
 
Please only respond to those who have actually done it... I really had surgery this week... I'm rattled... ..