Condition of your home is the only thing you, the seller, has control over that can effect the purchase price of your home. If there are some minor issues that you've been living with, like a drippy tap, stained carpet or the like, get the lead out and fix/clean them up. If a potential purchaser sees such items, they immediately worry about what ELSE they can't see has not been looked after.
Step outside your house, take a deep cleansing breath (really! This works) close your eyes and don't open them until you can become someone who is looking to purchase your home. Now, walk every facet, taking notes. You'll know what needs doing.
Mostly though, listen to your agent's recommendations. They have a vested interest in getting you the best price for your home.