It really is that simple.
It’s not enough to envision the life of your dreams. You have to act on that vision. Even if the act is as simple as a few brush strokes on paper, you are, in the moment you pick up the brush, an artist. You have acted. The dream is already a reality. Are you good? Who is the judge? It is more important that you begin. And that you pick up that brush. Again and again. Day after day. Ask any artist who is living their dream how they did it. They will tell you they failed, dozens of times. They were terrible before they were good. They ignored their critics. Or they learned from them. But the one thing they never did was quit.