Learning to make models is like learning to play an instrument. You only fail if you stop practicing. And the more you practice. The better you get. Everyone can play an instrument at some level. And everyone can make a 3D model to some degree. How good you get depends on your discipline to conquer your weaknesses. Some people need years of practice to make something good. Some people do it in weeks. But everyone has the ability to do it. As long as they put in the time. But you have to really want it.