I don't have a ticker-tape machine in my office.
Be aware of the level of the stock market. Are yields low and PE ratios high?
Devise a simple strategy so you can sleep at night.
I agree with Warren to keep it simple and not use higher mathematics in your analysis.
Have the courage of your convictions once you have made a decision.
Sell is tough. It's the worst, it's the most difficult thing of all.