Who you talk to is just as important as what questions you ask and what you pull away from it.

Recording interviews is like magic. a) It stops you from taking notes in the middle and b) you can play that recording for people.

The other mistake I think people make is talking to who's available rather than talking to who they need to talk to.

That's actually one of the most disappointing things about doing user interviews and user feedback, which is why I think... people don't do it. You're going to get negative news about your favorite pet feature most of the time.

Who would you talk to? That is the first question for almost any startup that you need to answer. Who is my user and where am I going to find them?

I wish I could tell you the recipe for figuring out who the target user is for your product and who your users should be, but... there isn't a recipe. It comes down to think really hard and use your judgement to figure out who you're really building this for.

The question is, once you have this idea, is this enough? Is it something people would actually switch just to have?