Either that or you're sitting hunched over your saw, and if I were to guess, one hand holds the bar and chain steady while the other ONE HAND works the file.
If you're not enjoying it, you're not doing it right... not that sharpening a chain is all pizza and fairy tales, but there's gratification in watching the top plate go straight and your tooth tip come to a wickedly sharp point.
One-handing a file over a wobbly chain saw, I can see, would be enough to make one consider buying an electric grinder. I had a real nice, super accurate Stihl chainsaw grinder with green grinding discs and pink and white ones of differing thicknesses, I had gauges and even a micrometer closeby. After two years and enough use to really get to know the thing, I got rid of it. I found an easier way, that I could do in the field, that didn't heat-treat the teeth and that got the teeth
sharper than I could do with the electric grinder. And cheaper.
Stand upright when you sharpen. Use two hands on the file. The rest is about proper angle and the right size file.