After keeping tabs on the hints Marie has dropped, I have discovered a few pointers. WCAG is just a standard, and not a replacement for the real questions. Can a disabled person use my product? To start at the “will I be able to sell to a govt owned or govt funded customer?” question, is not the only question you should be asking. Do you go directly to certify, or use a consultant, which route is cheaper, which is quicker? And that a new WCAG spec is in the wings, so be ready to do it all again if you already have.
But mostly, that being unable to even get a salesperson talking to some big customers is probably the biggest gotcha that you want to prepare for; by doing small steps right now; and to keep on talking about it in requirements meetings all of the time.