Let's assume a beginner enters into trading without knowledge and indeed most of them are not equipped with sufficient knowledge. So when they get a big profit from their first trade, then it is a stroke of luck. Why? because they entered the market without sufficient knowledge and without experience too. I think that is felt by some beginners who eventually think trading is easy, but they don't realize that they were just lucky at that time. However, not all beginner traders can feel this, it only happens to a few people. I remember some time ago my friend entered the market for the first time and they immediately felt a loss. So it was indeed because of luck.
Some beginners get lucky more than one time while others don't get lucky as your friend did but that doesn't dispute the fact that there's something called beginner luck for first time traders. Beginners shouldn't depend or expect this luck because when they do, they'll not get the luck. Luck isn't something that it's planned for, it'll happen to you when it's your lucky day, when it isn't, it won't happen. Newbies being lucky is what makes them to think that trading is easy hence, I'll prefer a newbie don't get an easy victory when he starts trading.
He should find trading difficult so he can focus on studying the market to understand everything about trading. Some newbie are lucky that they make a considerable amount of gains that they don't trade again and will tell anybody that asked them how easy trading is hence misleading others.
Yes this could happen all the time and this is why as an individual then dont make yourself that get confident just because of some few wins.The wrong thing about some people is that on the moment that they do experience some good situations then they do become that confident on which this is really that very wrong. This is why it would really be better that on the time that you've been experiencing those then put it up into your mind and if there are those situations on which it causes up that loses then take it up and go along with it or ride with the waves. You cant be that be profitable forvever, you might be able to experience a series or tons of loses after that and might be resulting into quitting or stopping just because you cant take it anymore. It is really that important that you are able to sustain or survive. This is the time that you would be making out some adjustments accordingly. Trading skill isnt something that you could be able to learn in a short period of time and a small amount of effort. It would take time and it will really be needing up that tons of trial and error and money that you do need up to spend. On the moment that you do have that good grasps of it.