Measure the door to determine how much material you need to remove from it. Measure the depth of the door to determine its height.
Set the table saw blade height using the gauge on the front of the saw. Set the blade height about 1/8 inch above the thickness of the panel.
Adjust the guide on top of the table saw and move it to the appropriate distance from the blade. For example, removing a 1/2 inch from the door panel means the guide should be the same distance from the table saw blade.
Turn on the table saw. Slowly push the door panel across the table and allow the saw to cut the panel. Keep your hands away from the blade by using a push tool for moving the panel.