I don't ask if they think my product is a good idea. I ask questions about how they work, delve deep into the mundane details of their work, understand what the challenges are. Finally I make my own assessment of whether my product will truly be valuable to them. I do plan on pitching to some of them later, once I've a fairly good understanding of how my target users work.I feel like that's the right way to do it. Those initial early calls aren't "sales calls" per-se, but depending on what you learn, you may well circle back to those people and try to sell them something later in the process.
All of what I did above was lifted straight from that book. I've been internalizing it for years, and still fail to follow it properly.
Same here. I have followed parts of it pretty closely at times, but it's hard to discipline yourself to stick to that more patient, rigorous approach sometimes. Too often I've been guilty of falling back into the conceit of thinking "of course this is a good idea" and starting to build stuff just because I convinced myself. :-(