Trading is only an unpredictable job if you have no skill in it because then you are just guessing what to buy when to buy when to sell etc if you analyze the market you'll have a rough idea ofcourse its still unpredictable but a lot less then with no skill.
Even if you have the skill trading is still unpredictable because no one can perfectly guess the market movement.
We are trading here and guessing base on our own analysis and it's not easy as we think, even experience traders have also losing times.