My bro had a "Sharpening Business" for many years. He sharpened all sorts of knives as well as meat grinder blades and scissors, especially hair dresser scissors.
Those take a special attention due to the proper angles needed.
Dad taught him how to sharpen tools many decades ago. He's especially good at it and used no sharpening devices or tools, all by hand. Some people are gifted at that.
He had many different stones, from several white ones and a large black stone that was somewhere from 1,000 to 5,000 grit. I don't remember exactly. That one was used to finish the hair dresser scissors.