I like to imagine that the product already exists, then attempt to sell it to a customer face to face / in person. Let's say I'm doing some kind of SaaS for ac

I like to imagine that the product already exists, then attempt to sell it to a customer face to face / in person. Let's say I'm doing some kind of SaaS for accountants. I would meet with dozens of accounts with a sales pitch for "x software". This will quickly help you figure out if what you're planning on building is actually valuable. Anybody that takes you up on the sale gets to be an early tester.