You don't have to be great to start, but you have to start to be great.
All of the greatest singers, writers, scentists, athletes and entrepreneurs of today have, at one point in time, known NOTHING about their craft. Nothing. Excellence starts with mistakes and lasting achievment begins with struggle.
We wouldn’t look up to someone if what they did was easy. We look up to people that have broken through the boundries of normality, one way or the other. So then, why would we postpone something that’s important for you? The perfect time might never come.
Waiting is usually worse that making mistakes. Why? Well, at least when you make a mistake you learn something, better and faster than you would in any other way.