Even when you have doubts, take that step. Take chances. Mistakes are never a failure - they can be turned into wisdom.
FAILURE, MISTAKES ARE NEVER A FAILURE
If you're not failing every now and again, it's a sign you're not doing anything very innovative.
It's not a very high failure rate if you choose people that you really like the sound of.
FAILURE, IT'S NOT A VERY HIGH FAILURE RATE IF YOU CHOOSE PEOPLE
Once you start a working on something, don't be afraid of failure and don't abandon it. People who work sincerely are the happiest.