Not only is it very expensive to 'learn from your mistakes' but very few people move often enough to gain the needed experience. Not only does this limit the pool of potential buyers but it also increases the chances that your home will sell for less than its actual value. This is due to the 'discount' often associated with properties that have been on the market for a longer than average time. It's been for sale forever'. Alternatively, if your asking price is too low, you are literally giving away your hard-earned equity just because you did not know what the market would bear.
First impressions are lasting impressions and can dramatically affect a property's perceived value.
It requires detailed background knowledge of all recent neighbourhood sales as well as homes currently for sale in order to estimate value accurately. In order to achieve the best sale price within a reasonable period of time you need an accurate indication of what the true market value of your property is. Knowing this allows you to properly price your home, thus maximizing your chances of selling and allowing you to make your future plans with the sure knowledge that your goals can be attained. Always keep in mind the big picture. As well, buyers might wonder why you are so anxious to sell.