For an example, this guest was particularly clever and charming:
https://www.youtube.com/watch?v=FJP2zkl_44o
J/k. It's me. I'm the guest. :)
BUT: this was our talk after he saw my livestream where I was stumbling around trying to do things in GT early on, so it might help other people.
I very much agree that it is hard to remember the beginner's mind. I also find that a larger challenge is that there isn't a single beginner's mind, but many. When the space is large and there are many paths, people can come from different directions. Finding commonalities seems to be significantly more difficult in that situation.
But this still leaves the problem of how to explain it before people work with the environment. The conversations in posts like these are very helpful, for example. I'd be interested in other suggestions that could help with that.
It's just so incredibly hard to remember that "beginner mind", that you really have to see it in action to understand just how much is in your brain, that you don't even realize.
That exercise will probably help your book more than anything.