Removing the Horns After the clamps are removed, scrape off the excess glue, and sand the joints between the stiles, rails and mullions until they are flat on both sides of the door.
I usually rig an outboard support using a pair of roller stands and an 8' long piece of style stock to support the heavy door while sawing off the horns.
Checking for Square Adjust the miter bar until the sides of the door are perpendicular to the saw blade. Slide the door over until it just touches the saw blade. Lower the blade below the table surface. Draw the table back towards the operator. Then raise the blade to make a cut which will remove the horns, and square the bottom of the door. Do the same on the top, and check the diagonal measurements for equality.
Installing Shop Shoes To keep your new door in pristine shape, install some shop shoes. Two pieces of 1 x 2 about 10 inches long will work fine. Attach them on the bottom of the door with two drywall screws. Now when the door is moved around the shop you can slide it on the floor without having to worry about damage. Note the rounded corners on this pair of shoes. These shoes have been used on several doors prior to this one.