Successful people think big and act big. Don't wait for opportunities to fall in your lap. Sniff them out. Successful people make big investments (in their careers, in their businesses, in their education) and all investments involve risk. Study your risks, make sure the odds are in your favor, and take a leap. Be bold.
Don't find reasons to procrastinate. Jump headfirst into the challenge and start chipping away. You never know what problems will present themselves before you step into the arena.