How do I properly prepare a wooden surface for refinishing by sanding off the old stain?

To properly prepare a wooden surface for refinishing by sanding off the old stain, start by removing any hardware or fixtures. Then, use coarse sandpaper to remove the old stain, working in the direction of the wood grain. Gradually switch to finer grit sandpaper to smooth the surface. Finally, wipe down the wood with a damp cloth to remove any dust before applying a new stain or finish.