Yes,it can be stressful. If you are trapped in stress, It can lead to poor decisions and make you over-trade. You must have the discipline to follow your trading plan regardless of what is going on in the markets to avoid stress. That is true in the long term, however, in the short term it is ok to take some emotion into account. If a trade does not go your way or you are in the red for the day, you are allowed to get frustrated and emotional. You must remember that trading is not a get rich quick scheme. You must build your capital up over the long term, and trading on emotions will not help you reach your goals.