How to handle an interview out of my league
Be happy for the opportunity to meet with the PI who's invited you for an interview, and go to the interview with an open mind and attitude. Answer questions you receive honestly and without artifice. Show rather than tell your enthusiasm for what's going on.

What's important is what you can do in the lab, and how you go about doing it. You might have a unique capability or perspective to bring that you don't know about it. Maybe your references are better than you think they are (and by extension you're undervaluing your skills!).

And try to avoid the impostor syndrome trap.