Place the Plexiglas on an even work surface.
Mark the Plexiglas with an oil pencil where you need to cut it. You may need to utilize a ruler or measuring tape to determine your lines are straight.
Along the lines you stamped, precisely score the Plexiglas five to 10 times with a glass cutter.
Move the scored segment to the edge of the work surface.
Apply a sharp descending drive on the Plexiglas to break it along the scored line