No one can be an expected to be an expert at something before they have got the chance to practice it.
More Finnish Proverbs:
The child led by the hand never learns to walk.Finnish
The pot reproaching the kettle.
Finnish
If you borrow some chaff from the rich man you have to repay him with wheat.
Finnish
The old cow forgets that she was once a calf.
Finnish
A little bit of experience is better than a barrel full of knowledge.
Finnish
You don't get anywhere if you run in your thoughts.
Finnish