Keep lawn trimmed and edged. Be sure front door is scrubbed and repainted if necessary. Kitchens and bathrooms should sparkle. Keep all steps clear of hazards. Fill all light sockets with bulbs.
Illumination is like a welcome sign.
Wash dishes, put away clothes, straighten up living areas. Make up beds with attractive spreads. Keep pets out of the way when showing. Avoid having too many people present during showings. The potential buyer may feel like an intruder and will hurry through the house.