CUTTING AND SNAPPING A STRAIGHT LINE
Practice holding the glass cutter until you feel comfortable with it. Hold it upright and apply firm, steady pressure down on to the glass surface, so that the base of the cutter is parallel to the glass.
Use a straight edge to guide the cutter. Holding the cutter firmly, pull it towards you to score the glass, easing off the pressure as you reach the end of the line being cut.
Take hold of one end of the glass, placing your thumbs on either side of the score line, and apply pressure upwards with your fingers on either side of the score line beneath the glass
The glass will break along the line with a sharp snap. Make sure you are holding it away from the work surface as it does this. Any rough edges can be smoothed later.
To cut a narrow strip of glass, score the line as before. Hold the main piece of glass in one hand and apply pressure with the pliers centrally on the other side of the scored line.
Apply a downward pressure on the grozing pliers, pulling slightly outwards from the glass, The glass should produce a clean break, as before, along the line scored previously.