悪い業者は嫌いです 3 Look on a few YouTube videos on how to use it and then it is super easy to use. However watch a few different once to get tips and hints on how to use a tool like this.1. Cut the glass using a ruler or freehand.2. Turn the glass upside down and place on a towel (cut side facing down)3. Then press on sides of the cut carefully and it cracks just where you cut.Note, The towel made the difference for me.