It is always a good idea, prior to calling an agent for an initial meeting, to clear out unwanted items and clutter from your home and yard. Also give your home a thorough cleaning. The mentality is to think you only get one first impression, make it count.
Donate furniture, clothing, kitchen items you never use and get a receipt for your taxes at the end of the year.
Lock away important documents and weapons.
Organize basement items, attic items to look tidy and neat.
Old dingy basements, it helps to give them a fresh coat of white, waterproofing paint on the walls.
Keep bathrooms clean, get rid of well water stains if applicable. Keep the toilet lids down.
Lastly keep counters clutter free.