“Nothing” is the most common response.
Do nothing until you do know the answer. Study and practice and wait for approval and then do something.
Which is fine (for a surgeon) but what happens most of the time? Most of the time there’s something that needs to be done where the answer is unknowable until you do it…
That’s what we’re waiting for you to do.
By Seth Godin: http://sethgodin.typepad.com/