Do you give them the sun, moon, and stars? This one is tricky and I am sure I will add to it as I see more examples. But I certainly have seen both extremes and everything in between when it comes to how much to give to a client in order to show a client that we know what we are doing and they should ride with us on the SEO journey.
It seems I have encountered both ends of the spectrum as of late in my SEO freelance experience. On one end I have this fleet management company that gets absolutely no information while several other small businesses gets the veil lifted on pretty much everything. Kind of weird to see how the two turn out, promise to keep you posted.