MMC

Hi all, I have scarring in my hairline due to previous surgery. I have had two quotes done for FUE. One using Neograft and the other 'micro' FUE. My biggest fear is my current situation becoming worse if the hair transplant surgery isn't successful. What is the possibility of this happening? The doctor and technician advised that the worst case scenario is that the donor site isn't improved much but that it won't be any worse than my current situation. Is this correct? I'm also that if I have shock loss in the recipient site it's going to be really obvious for a 6 months or so. Has anyone hair transplants in a similar area of scar tissue. Any recommendations? Thanks in advance for your advice!