Measure the area where the table will go. Determine how far the table will stick out from the wall. Leave enough room for a chair to easily move in and out of the area.
Measure and mark the line locations on the wood board with a carpenter's pencil. Draw a triangle shape for the table on the board.
Cut out the triangle using a jigsaw.
Mark the position of the three leg brackets onto the wood. Position the two front legs at least 2 inches from the corners and the third leg 4 inches away from the back corner of the table, equidistant from the sides.
Attach the brackets to the bottom of the table.
Screw the legs into the brackets.
Sand the top and sides of the tables with the power rotating sander. Create a smooth surface by sanding with the 90-grit sandpaper and then progressively increasing the grit amounts until you use the 220-grit. Sand the wood completely smooth with no splinters.
Apply shellac to the sides and top of the table with a sponge brush. Always go with the grain for a smooth finish.