My smart investor friend says buy on rumours and sell on news. Keep an eye on already run up in anticipation of good results and in that case just dont buy on good results.

a must but not for faint hearted.

Never never never enter in a stock in a hurry. If you do almost sure you will later worry.
Have patience , stay put on your decisions, take your time and remember...
you can only lose if you have put money, till that time it's all virtual gain/loss.