As Seth Godin is fond of pointing out, there is never a good time to start anything – therefore the best time to start whatever it is you want to do is now.
If you stop and think about it, this is empowering rather than scary.
So quit second guessing yourself, grow some fucking balls, and just go.
It’s really not that hard, and there’s an added benefit – facing the unknown on your own volition can be exhilarating.