It is far better to find out by testing what your ideas will do, and then offer solid proof of your tests. It is also far better to have worked out all the rough spots, and come up with the easiest way to make the products, before you start taking orders. Once you decide, stay the course. Take as long as necessary to decide. Most people quit before they have a chance to succeed.
Success is primarily a matter of perserverance.
Get all the help available. The indecisive client is the one we worry about constantly, because the self-doubt about his decision to go into bullet making, about the design of bullet or the caliber selected, about the market or the size of equipment he can afford, usually leads to a series of changes in the pending orders. This means a lot of wasted effort on our part, and long delays in finally getting the latest decision of the moment into that client's hands. But worse than that, a person who is half decided and orders anyway is a person who is not committed to success in his business. Wanting success is not the same thing as being committed to it.