The next step in this project is to cut the border glass.
Score the glass with your glass cutter, (don’t forget to fill the cutter with cutting oil).
For the best score possible, hold the glass cutter at a perpendicular angle to the glass being cut. Once the glass is scored, using the glass nippers, hold the glass on one side of the score and break it off on the other side of the score. If you have scored it deeply enough it should break with no problem.