I went to a master stylist to have my hair colored brown(my natural color). I have minimal gray and a few blond highlights that also had to be colored. He used a 6 medium brown at 15%. I didn't realize until I got home that it had a green hue and looked awful. I went back to him two weeks later (he kept telling me the green would fade), and he added a temporary shade, 5 medium auburn. Two weeks later it still has a green hue. It so horrible and I don't want to go back to him. What can I do to fix it myself?

You better find another stylist.