"You don't have to get it right, you just have to get it going."
Most people wait until everything is perfect until they take action. In our cases, wait until they have their website up, business cards, office, fax line, etc.
Problem with that is there is no way of knowing if what you're trying to sell (in our case, ourselves) is something people are willing to pay for. Until you put yourself out there and the market gives you feedback, you won't know what works and what doesn't.
Successful entrepreneurs get an idea and run with it. They get it out there. They get feedback and then adjust as they go.
That's really all any of this is...
Testing-->Feedback-->Make Adjustments-->More Testing-->More Feedback-->More Adjustments
It's a never ending cycle of testing, getting feedback, adjusting, and starting the process all over again.
Just start sailing, you can adjust your sails as you go.