I think this is where starting out small and simple usually works. You normally start with an idea that somebody wants whether it's you or a friend. You want your house to warm when you wake up and when you come home. You convince some other people. You build a small prototype. You try it out on people. They either want one or they don't.

We all know companies that have built products that nobody wants. They went through all the planning, product development, market research, production, and the result was nobody wanted it. It's a myth that if you build it, they will come. People have to want your product at each stage of the process.