I would say today is very hard to be professional Bitcoin trader. Trading is not anymore as it used to be, it requires many knowledge, skills, experience and full dedication, almost 24/7 presence at the market. For me professional trader is one that is able to make for a living with Bitcoin trading and I think there are very few of such people.
How can you say the trading bitcoin or becoming a professional trader of bitcoin is too hard? For your information, Bitcoin trading is not that hard because it is easy to understand and you just need to study the basic fundamentals like reading charts, analyzing the news or updates and so on.. you don't need to spend 24/7 in front of the computers that you got, you can trade within a minutes or hour and still make a profit.