Using a knife and sword sharpening stone involves a few key steps to maintain a keen edge. First, select the appropriate grit for your blade’s condition: coarse for dull edges, fine for routine honing. Wet the stone with water or oil to reduce friction. For swords, use a larger stone and maintain control to avoid uneven sharpening. Finish with a finer grit stone for a polished edge, and clean the blade and stone after use.