TL;dr - professional gambling is either very difficult at best or just a fool's errand at worst
Anyone who actually recommends gambling as a profession is selling some scam system.
Even those who sell something like the essential book on professional gambling, Gambling for a Living by Sklansky and Malmuth, I strongly suspect are earning more now selling books through Two Plus Two than they ever did gambling. Neither of those two have, so far as I know, ever been seen at the Big Game in Bobby's Room. That book is definitely essential if someone is insane or stupid enough actually to want to be a professional gambler.
There are, indeed, a few people who make a lot of money doing this stuff. Emphasis on few. But if you walk down the Las Vegas Strip and look at those buildings, they didn't build themselves. They don't call it "Lost Wages" for nothing. It is also the suicide capital of the United States, by far. I don't think anyone sane would claim the fact that it is also the gambling capital of the United States is a coincidence.
To anyone considering gambling as a profession, even someone with the skills and talent actually to do it, consider, if you have a job, how disappointed you are to see your paycheck every week, or at least look it up online with your bank (hey I grew up when you actually got a check on paper). Now, imagine that you didn't work 40 or even 60 but instead 80 hours, and not only don't you have a check, but you actually lost money. Imagine this going on for weeks or months.
Now, there's certainly fun parts, such as when you go on a hot streak and every single bet goes right, and you make more in a week than you ever made in a year, and this also goes on for weeks or months.
But no. Seriously (to answer again the question of the OP), while it IS possible to gamble for a living, EVEN if you have the skill to do it (and you probably don't), DON'T do it. Unless you really, really want to.
I think a better question is, "is it possible to gamble profitably?" The answer to that is definitely yes, and if you aren't depending on it for a living, and finding edges and beating other people and beating your OWN mental weaknesses is fun to you, do it. Poker especially has a lot of lessons to teach about how other people think and how their actions connect to how they think, and to your own mental weaknesses, and if you learn those lessons, you get paid! Poker, while it contains life lessons, as a life is a black hole as life itself is concerned. Stay away from the event horizon.