Refinishing hardwood floors in the home is a big job to handle. If you're going to tackle it yourself make sure you have the assistance of a floor sander you can rent from your local rental store. Proper planning before you begin is just as important, so here's a few tips to get started in the right direction.   Helpful Hints Check fuse supply as machine may overload the circuit. Remove furniture, rugs, curtains, pictures, and any other conveniently removable items. Complete wall covering and painting project before you refinish the floor. Provide adequate ventilation during sanding and refinishing. IF the room has a large doorway, cover it with a dropcloth or plastic covering. Stuff extra towels or rags under bottoms of exit or closet doors and cover all air vents. NEVER stop the sander with the drum in contact with the floor. Wear clean soft footwear to avoid dirt marks and scratching.