Sales depend on talent, just two months, some half a year or even longer.

I think I like or can read my professional books. Study hard for one year, and practice hard for one year is enough.

Of course, you have to be able to take classes. You have to take exams and sell classes in order to exercise in class. You should also have money to eat, buy books, train, increase sales and sell classes, and work hard for one year, then you can say that you are a major. Slow down. Two years is enough. This is not picking things up. Say you don't work for ten years. Can you say that you are a professional? According to the current national coach level, it is absolutely enough for you to study hard for two years. How many have read more than five books 10?