Measure the Silestone and determine how much needs to be trimmed in order for it to fit on the counter top. Mark that measurement on the Silestone with a pencil or highlighter.
Fill the wet saw's water tray with water.
Plug the wet saw into an electric wall socket.
Slide the wet saw's table extensions out and lock them in place by flipping up the locking tabs.
Adjust the saw's cutting depth adjustment knob to the depth needed to cut through the counter top and have the assistant hold the piece of counter top on the saw table
Lower the cutting arm and slowly cut through the Silestone to trim it to size.
Lift the counter top and set it into place to make sure it fits properly.