I began the process with an exacto knife and a pencil. Using the pencil, I drew triangles on my shoes to mark the places I would cut out. Then I began cutting them out. I was actually surprised at how incredibly easy it was to do this. I used more of a poking motion than a slicing as the knife has to penetrate a few small layers. Cutting triangles was really easy, I'm not sure how successful I would have been if they were circles.
Before the spray paint debacle.
After the cut outs are made and past fails are put far, far behind you, you will need a bucket o' paint and a small foam brush. Paint a couple of layers, or until there is full coverage. They dry fairly quickly, so there is not a whole lot of time to anxiously await. :) I originally wanted to do white with the black but I didn't have any in the house and could resist.