[ Tony's expression shifts like he's not sure if he wants to be amused or exasperated or both or neither, but in the end he just lets out a long slow breath. ]

I'm working on it. But you might have noticed that he's a little on the stubborn side.

[ Which is a bit like describing water as a little wet, but whatever. ]

He gets it into his head that he has to do things by himself. [ And because Tony is Tony, he can't help adding a dnost and, ] Sound familiar?