Overpricing usually increases time on the market, and adds to the carrying costs. Ultimately, many overpriced properties sell below market value. Home Buyers look for homes, not houses, and they buy the home in which they would like to live. Owners who fail to make necessary repairs, who don't spruce up the home inside and out, touch up the paint and landscaping, can chase buyers away as rapidly as Realtors can bring them. If you were selling a car, you would wash it, or maybe even detail it to get the highest price.
Houses are no different.
It's difficult for them to do that if you follow them around pointing out every improvement that you made. It may even have the opposite effect you want, by making them feel they are intruding on your private space. Resist the temptation to talk the entire time a buyer is there, and let them discover things on their own. Try tastefully to point out some hidden amenities they may have missed. For Sale By Owners, always get more activity than houses listed with an agent.