It's unusual, but possible, Peter.
The people who often manage it include only small minority groups: those who join a financial institution as graduate trainees and receive a few months full-time professional training before being allowed to click a mouse or lift a phone; people from trading family backgrounds; people who are skilled at statistics and probability before they start and then spend a very long time practicing their skills on demo. Over the years I've known a few very successful traders from each of those three groups.
Still very few people, overall, though.
Seen in other forums, too (but banned from them). One of the people who has learned that it's easier for himself to make money by "coaching beginners" than it is by trading (unfortunately for him, some of his posts here were so inane and stupid that people realised he knows very little, and was just using the forum to promote his "tuition". Maybe he couldn't afford to advertise legitimately, so he just tried forum spamming instead? That's my guess. Unfortunately quite a common story. Doubtless banned here now, too.)