Hesitation kills confidence and trust in yourself.

When you are hesitant, you will let many opportunities pass by. Another opportunity may come again, but maybe NOT. You don't know it and that's why you need to appreciate and seize each time opportunity comes your way. 

It doesn't really matter whether you will get what you want when you take action each time opportunity comes. What more important is you learn to make a quick decision and trust what you know best in the moment.