Your objective in the market is not to be right but to make big money when you are right. This helps to concentrate buying when right and forces sells in weaker stocks as money dries up. During 1957-1959, the then tiny Dreyfus Fund, in many cases had results twice as good as it's competitors. After looking at over 100 new stocks the fund had bought, it was discovered that every single new stock was purchased at the highest price the stock had sold for in the past year. Jack Dreyfus only bought when the price broke into new high ground.
Most people never analyze their failures.
Long evenings of study led to rules, disciplines, and a plan that finally worked. A list of 36 Prime Selling Pointers can be found in Chapter 10 of his book. This move is usually at or very close to a stock's peak. Consider selling if a stock runs up and then good news or major publicity is released. New highs on decreased or poor volume means there is temporarily no demand for the stock at that level and selling may soon overcome the stock.