That's the only answer. Get off your butt, stop taking in more feedback and other excuses for you to actually do something, and start building the prototype now. There are always reasons for you to wait, gather more data and feedback, etc, but all that will do is stall you and make you lose momentum. Start coding now, and don't worry about what you do or do not know, just do it.
I totally agree I should be doing what I can, even if that is just finding out where I get stuck and then outsourcing the bits where I fall short.
I just want to make a good job of it.
If you take the risk, there is an x% chance of success with your new venture. (You fill in x.)
If you continue to work your day job, there is a 100% chance you will continue to work your day job.
I suspect you already know which path you want to take.
Sometimes with outsourcing you just swap coding hours for project management hours. I know from experience it takes a lot to keep a distributed team on track.