Sell is tough. It's the worst, it's the most difficult thing of all.
Each year we buy stocks and they go up, we sell them and then we try to buy something cheaper.
Be sure that debt does not exceed 100% of the equity.
Before selling, try to re-evaluate the company again and see where the stock sells in realtion to its book value.
Don't buy on tips or for a quick move.
When you buy a depressed company it's not going to go up right after you buy it, believe me.