I've sharpened thousands of blades over the years and am fairly good at it. My lady is a dog groomer and I regularly sharpen her clipper blades with pretty good results. I have a large selection of oil stones from course to black surgical. However, I cannot seem to get the process of sharpening her curved scissors down to a usable edge. That curve just busts my sensitive parts to no end. Any suggestions from the group? I sharpen by hand and prefer to not have to purchase a machine, but I will do whatever is necessary to avoid her having to pay the $35/per fee of a commercial service if I can. Thanks in advance.