What I have learnt in trading is to always monitor the market and most importantly know when to sell off, don't always wait to make the maximum profit as that might actually be your downfall.
The market is sometimes a bitch, but we need to understand.
If we can maintain our patience, we can make our way through. I am not that patient so when I usually see an opportunity, I grab it and wait again. There are those days that I've made mistakes but that is a part of learning and for me, that is important. Life is not always great, the same as what we are doing.