Trading is one bad and difficult game and even the experienced people cannot earn every day in the market but somehow if you are an experienced and professional trader, you can make good money.
But is that not true for every other risk based income? Do you have zero risk in stock market or precious metal market? Its same in all of them and if you are not willing to take the risk associated with it then its better not to enter them.
That said, there are safe practices of trading and if you have been following the market prices of different coins then you might be able to place orders according to market movements. What I mean is that you can buy low and sell high easily if you have patience.
I want to make people understand of the fact that there is always risk associated with money. Either you are earning it from somewhere or selling something that would give you money back. It might be problematic for you if you keep yourself introvert and dont let yourself face this risk. Because some wise person once said, dont want to face risk, die.