"How to think like a professional" is better quality & easier to follow the principles he teaches.
What he drives home is that you do not know the outcome of any one single trade that you place, but over a series of trades the positive expectancy of your system or "edge" will show itself and the percentage of winning trades will prove that edge over a series of trades. You cannot tell ahead of time what trades are going to be winners or Losers.
Fear of Loss causes Hesititation, taking profits too early, holding onto losses etc. Concentrate on the process of trading & not the outcome of each trade.