Funny game this, I made 200% on my money today and I still feel...

Funny game this, I made 200% on my money today and I still feel lousy because I stuffed up my whole exit strategy because I dreamed, wished and was greedy. I'm not bragging about my profit trust me, far from it, I learnt a costly exercise today and one that I hope I will not make again (said with a degree of doubt). I was told by a very astute person once to always sell into the announcement (did I - of course not - see above reasons) never buy into it as the market generally knows whats going on before hand and you can't go broke taking a profit.....wise words indeed.