"Never be afraid to try something new. Remember amateurs built the ark, but professionals built the Titanic"
Why sometimes people feel fear before they start doing some new things? May they haven't enough knowledge in that sphere,maybe they are afraid of mistake... I think all answer are right . I know people who are sure that they are not overfilled but they are inflamed with the idea to have a new hobby. That's great because flexibility of their brain is developing and brains became productive.
I think that we shouldn't be afraid of mistakes. Because the best teacher for us-our mistakes .I proved it by my own experience .If we do something we develop ourselfs .If firstly we couldn't do that we try  more and more and became professionals . Practice makes perfect !