Sell is tough. It's the worst, it's the most difficult thing of all.
I tried to follow Ben Graham's ideas.
If the stock goes down we want to buy more.
I found that it was much better to look at the figures rather than people.
If there are not too many value stocks that I can find, the market isn't all that cheap.
If you are honest, hardworking, reasonably intelligent and have good common sense, you can do well in the investment field as long as you are not too greedy and don't get too emotional when things go against you.