1) Do a walk-through. Is the house warm and inviting or does it look run-down, old or cluttered?
2) Touch up paint in all rooms. If the paint looks particularly unsightly in one room, repaint in a neutral color.
3) Make sure the kitchen and bathrooms shine. Remove all clutter, caulk around the tub and sinks. Shine the fixtures.
4) Prepare for a showing as you would for friends coming over. Make the beds, pick up clothing, sweep and mop as needed. Make it easy for prospective buyers to move through the house.
5) Storage space will interest buyers. Make sure your closets are clutter-free and don't look jammed. Consider moving out-of-season items to storage.
6) Too much furniture can make a room feel cramped. Consider moving less-used items to storage as well.
7) Make sure your front door and entry are spotless.
8) Now walk outside and look (objectively) at what potential buyers see from the road. Will they ask to see the inside based on what they see and the price you're asking?