Master Sang has said in the past that it is possible to remove a mole and change the fortune. I would say that you are changing your own qi to a certain degree.
As to eyebrows, since they relate to family, I would think that this would not be a good thing to have them removed. Also, the more full the eyebrows, often the more wisdom a person has. So I guess that removing them, would not be a wise idea… 😀