I had a leg up to begin with. I started with an audience (of sorts) that I was able to poll to gauge interest. I didn't start building until literally 200 peopl

I had a leg up to begin with. I started with an audience (of sorts) that I was able to poll to gauge interest. I didn't start building until literally 200 people told me they would buy it from me. Turns out most of them were blowing some kind of sunshine (or else they found another solution before I could launch one to meet their needs), and very few converted... But, just the fact that they said yes to my product and price point gave me the confidence to start. But, I think you can hijack someone else's product-confidence... by which I mean you should find a 800-pound gorilla competitor in your market and just follow them into battle, and eventually outflank them. Not gonna lie, I did this too, because I got to a place where my market-vision was limited... so I piggybacked on a competitors market vision. :)