Let the kettle sit overnight. In the morning, test the corn. It should be soft enough to pierce with a fingernail, but still very much "al dente." The outside should be butter yellow and the inside chalky white. Rinse some and taste it - now you should barely be able to taste the cal - if it tastes strong, rinse the corn and let sit in fresh water for a while. Rinse and rub off the corn skins. They are very delicate and sometimes barely visible. Don't worry about getting every little bit.
Run the corn through your grinder. I used a meat grinder with the finest disk.