Interviewing people (not for a job, the other kind) is wildly hard. Harder than most people would expect. I've been doing it for years, and I still think I'm bad it it, or at the least, I still make a ton of rookie mistakes. In any case, I tried to write down some things that have helped me get better over the years.

https://brianlovin.com/writing/becoming-a-better-interviewer