Let's try this again.
Wednesday
You might think that when you're in the midst of a power struggle you need to be full of bluster and aggressive energy, and most of the time that is wise. But today, when you are stuck trying to negotiate getting your way, the worst thing in the world to do is to be too pompous or confident. Let this person know that you want to find a solution that makes both of you happy -- you have no interest in bulldozing over them. With true collaboration you can find an answer.
As if I have a problem with being too pompous or confident. There's a new manager starting work today, so 'power struggle' might actually stretch to being applicable.