When I teach the girls in the studio how to use the electric bobbin winder, we do the following. They start with a bare foot. I get them to place their whole foot on the pedal, kind of grabbing the high end with their toes. They then start playing with the pedal without a bobbin on it so they learn to control the speed. You will find it easy to explore the feeling and speed. Once you feel you have it under control, then put the bobbin on and you’ll be golden.