We used a razor blade to cut a square opening to the size of our liking. Using the piece we cut out of the center we cut and scored a rectangle to hang as a shelf and another scalloped edge to finish the top of the stage and hide the curtain wires.
The picture wire is strung across the top and secured. We poked it thorugh to the back of the stage and then hotglued it down under two more small pieces of ribbon. The curtains were threaded over the picture wire to our desired length before we "hemmed" them up in the back with a bit more hot glue. The curtains easily slide back and forth on the picture wire to start and end the show. When they are not in use they push behind the small white hooks we added to each side