How is buccal fat removal done? Also, I have a receding chin. One surgeon seems to suggest sliding genioplasty for me but..

1. Are the buccal fat pads a standard size i.e. a dr can only take so much or can a dr overdo it/make your face too thin? 2. I am currently using Invisalign to make room for an implant as apparently the right side is shorter than the left & missing 1 tooth causing asymmetry. Should I wait to finish my course? I would preferably like to do all procedures at one go to reduce recovery time. Why would a doctor recommend sliding genioplasty over chin implant for me? What are the major differences?