I heard Giulianni on Trump few days ago, and he has know him for years. He Said one thing certain about Trump, is that he loves to succeed. That is why he will succeed as president, without a doubt. Trump will do what he says he will do, because it is a point of success for him.
That’s exactly the impression I got reading his books. He doesn’t want to be seen as not succeeding at what he promised. He’s not like a politician at all - where talking is an accomplishment in itself.
I’m glad someone that knows him verified it ;)