I found the 20 people I needed to talk to.

I found out where they worked.

I called the public number.

I asked to talk to them.

I explained I was thinking about starting a startup and I needed some help thinking through some ideas.

2 of them told me they couldn't give me the time. 15 gave me a longer than 1 hour call at a later date, 3 of them let me fly out to them and spend a day with them.

Took me about 5/6 months.