Can you recommend how to go about this? It's the first i've heard of this strategy, and interviews are a big fear of mine. I would have assumed most of these "pay for feedback" things to be scams in one way or another. Thoughts?
Full disclosure: I provide paid professional career mentorship and coaching. Contact info is in my profile.
I know some people are opposed to hiring a paid resource, yet when I hired someone for myself, my career abilities and achievements increased much faster than before. And I still meet with a professional mentor regularly.
Of course, both the compatibility and quality of the resource matter, so by all means talk with a few people until you find the right match for you.
If CEOs, actors, athletes, and other pros hire someone to help, why shouldn't you?