Start along an outside corner of the wall if possible. Lay the crown molding upside down on the miter saw table so that the ceiling side of the molding is on the bottom, with the outside of the ceiling side sitting farthest away from the blade; the wall side should be the first edge you cut.. Hold the molding up on the wall so that one side touches the wall and the other touches the ceiling. The wall edge of the mitered end should touch the side of the corner; the ceiling side will protrude slightly past the corner.