A pro trader is almost like a fortune teller when it comes to forex. They know exactly when the market will get be ready for them. They know how certain pairs behave most of the time. They know the best way to make money. They know one hundred way not to trade a pair. They know how they will fail and how they will gain profit. They know a bad broker from a good one. They know not to put all of their eggs in one basket.
Not exactly like that, i know that a professional is a trader that spend their time for forex only and this forex become their permanent jobs, but it does not mean they are fortune teller, they also make false signal, they also create a big mistake, but aside from that thing they make more profit rather than loss, for example:
1st day = +$500
2nd day= -$100
3rd day= -$200
4th day= -$200
5th day= +$1000
6th day= -$400
7th day= -$ 400
You see?, the trade loss 5 times but make profit only 2 times but if you calculate that all, that trader still make profit for $200 so in the end the professional is a trade that can make profit and the one who can bear with the risk also already have a lot of experience in forex while beginner as we know just a newbie.