Presidents cannot just go in and fire everyone. They cannot enact legislation the cannot make treaties without consent. How is Trump going to clean house?
All Presidents delegate duty and Reagan was known especially for doing that. I'm sure there are capable persons who could be hired to do such if Trump's momentum keeps up and he found himself in the White House.
To do what? Fire civil servants? Won’t happen
If on the other hand you mean deal with the bureaucracy and congress....granted. I don’t trust Trump. He is at heart a sycophant. He is a HUGE supporter of the LGBT community and until just this year approved of O and dims and all they were doing