Trading involves risk. It is this risk that makes people "uncomfortable".  I play close attention to my state of mind when trading, because I notice sometimes when I place a trade with a feeling of confidence, chances are that trade is likely to turn sour in the end. And when I was in doubt when placing that particular trade, it turned out fine! So each trade is based on my own calculation of probability of success given the risk scenario that I am projecting. In the end, "feeling comfortable by being uncomfortable" is what I am pursuing. And this is a great challenge to me because who would want to be constantly feeling uncomfortable in their mind? 

I believe each trader has his or her own unique personality that only he or she alone can determine what types of trading systems or styles that suit them. If you see other people become successful in trading, do not envy them, it would not be a good idea if you copy their trading systems, because the results will not be the same.

In addition, we have to acknowledge that the trading environment is dynamic, you need to be flexible to adapt to the trading environment. What has worked before may not necessarily work in the current market condition. Hence, the only way to overcome this is to keep on learning.