I genuinely don't think Trump expected to get this far either, but I do believe he planned for it, if not solely for a means of keeping morale up on the campaign trail. As a businessman he is a master of the code-switch and, in his words, "can be Presidential when [he] wants to be." I also think that his cabinet is going to be an assembled team of specialists he'll assign tasks to, as opposed to a consultative committee that a lot of Americans expect it to be. They're not going to back up the rhetoric of his campaign platform to a T, certainly, but they're going to be faithful to the general ideas he pushed - infrastructure renovation, firmer border control, and a more America-centric diplomatic standpoint
You have to ask yourself what he wants out of the Presidency, being the individual he is. He doesn't want political power like Hillary does, he doesn't want to drastically alter the world in his vision, he just wants glory. If his statements on his personal wealth are to be believed (and I have to admit at times they're pretty shaky), he probably looks at his current amount of cash as "enough." I know I would if I had even 1 billion dollars in my bank accounts. So his methods of achieving glory are going to be the promotion of immediate changes in the short term (think FDR) due to the stacked Capitol, and after that, probably more general promises and speeches in the way of Fidel Castro
And as a side note Viri while I don't think quite all of the geopolitical disputes of former British colonies are entirely the British's fault, the Pakistan/India/Bangladesh situation DEFINITELY is.