Failing to Showcase the Home. Owners who fail to make necessary repairs and keep it clean and neat chase buyers away as rapidly as Realtors can bring them in. Buyers are often poor judges of the cost of repairs, and usually build in a large margin for error when offering on such a property. Sellers are usually better off doing the work themselves ahead of time. If you were selling a car, you would wash it, or maybe event detail it to get the highest price.
Houses are no different.
Not Vacating Your Home During Showings. Buying a home is an emotional decision. People like to try on a house and see if it is comfortable for them. It's difficult to do that if you follow them around pointing out every improvement that you have made. It may even have the opposite effect by making them feel like they are intruding on your private space.