I use belts to sharpen most exclusively, sometimes using a guided system, but I always enjoy sharpening with the edge in one hand and the stone in the other using a circular motion. Not advised but I used this technique sharpening tools for work that not many are familiar with. Hand hewn log homes. You learn the value of a sharp tool pretty fast!The need to hold a highly consistent angle is greatly exaggerated. I've seen people sharpen with stone in one hand and blade in the other. There is no way the angle is that consistent, but the edges are hair whittling sharp. Don't make it more complicated than it is.
Like you said, "don't make it more complicated than it is",. Very similar to one of the worlds most famous knife makers told me recently!