I use a series of whetstones (120, 240, 400, 800, 1000, 6000, and 12000 grit) to sharpen my scissors and kiridashi, which seem to be the tools that need sharpening most frequently. I don’t typically start with the coarsest stone in the series as that removes more material than is truly necessary. I don’t have a good sharpening solution for concave cutters, but I guess I’ll cross that bridge when I get there. I haven’t really needed to sharpen them yet.