You should be able to barely get 1 corner away from the surface underneath it.
How to safely take off sheet of glass from table.
Dig down with your fingernails until you find the bottom of the tempered glass.
Exactly what i was going to suggest.
Two to lift two to receive.
Therefore it must be either laminated glass two layers of glass with a clear interlayer between them which it adheres to or ordinary annealed glass.
Lift 1 corner of the glass with your fingernails.
If the stump or concrete block is 12 inches high the glass will rest at an approximate angle of 5 degrees.
Wrap it in a sheet use hammer rock large book etc to break up and then bundle the old sheet into the trash can.
Rest one end of the unbroken sheet of tempered glass on top of the stump or block.
Place the other end on the ground on top of the paper or tarp.
Use your upper hand without a cup as a guide hand to maintain balance.
Place the glass down flat on the ground and cover the entire pane with an old blanket or several old towels to keep the shards in place before using a hammer or shovel to break the pane.
If the glass is heavy use a suction cup for your lower hand.
If so as your other contributors suggest.
Mark clement moving big glass up staging requires four workers.