The biggest barrier to success is fear of failure. People are quick to make excuses and put limits on their dreams, but there's always an avenue you can take to make your ideas a reality. Just because you don't have all the answers doesn't mean you should quit before you even get started.
Steve Jobs wasn't the computer guy, he was the ideas man. Visionaries can't do it all, but they CAN surround themselves with the tools and people they need to make it a reality.
As you're writing down your ideas don't focus on what you don't know, focus on making your dreams into a reality.