It is possible, I know, because it's what I did. But I'd had an initial four years on demo only, and learning, and reading textbooks, and getting screen-experience, before I ever had a real-money account. After those four years, I opened an account with about £2,000 and built it up very gradually and persistently without ever making a withdrawal from it. But I was actually making what most people would call a "decent living" and monthly withdrawals from it, within about three years after that.