Many gurus said that trading was very hard work, even the hardest work in the world. It sounds very convincing, it makes you feel guilty if you don't study the charts 12 hours a day.
But on the other hand, it seems more important to find a setup that matches your personality and works for you. For me, trading the first 10~30 minutes works best for me, if I keep trading, I usually give back my profit, or even turn a winning day into a losing one. So, trading 30 minutes gives me the best result, and it's not hard work.
I believe, if you do it right, trading should be happy, relaxed and easy experience.
To me, at this point, it's unproductive and misleading to believe trading is hard work.