Glue a thin strip of sandpaper to the bottom edge of the ruler. Move your mat closer to the edge of the table so that you can hook your thumb under the edge. This lets you put more finger pressure on the ruler. Make sure that your fingers are out of the way and make 1 smooth continuous stroke with the cutter. press firmly but don't muscle down on it. Cutting bands is like any other skill. Practice and time. My first bands looked like I had chewed them off of the sheet.