[–] Onlio 0 points 1 points (+1|-0) ago 

Out-think him. Try to set up a meeting before it is the last minute. Try to anticipate what his changes may be (or think about what the worst case scenario would be). Be prepared, not with reasons why not to do the things he wants (don't be negative) but state where he has a point and do a couple of his changes. Do whatever you can to make him think that everything was his idea, and what a great idea that was. Don't be stubborn. Learn to work the system. Read a book on persuasion.