I train myself mentally with visualization. The morning of a tournament, before I put my feet on the floor, I visualize myself making perfect runs with emphasis on technique, all the way through to what my personal best is in practice.... The more you work with this type of visualization, especially when you do it on a day-to-day basis, you'll actually begin to feel your muscles contracting at the appropriate times.
My method is different. I do not rush into actual work. When I get a new idea, I start at once building it up in my imagination, and make improvements and operate the device in my mind. When I have gone so far as to embody everything in my invention, every possible improvement I can think of, and when I see no fault anywhere, I put into concrete form the final product of my brain.