Trump built a massive real estate and marketing empire by staying out of the fray. He would come in at the last minute to close the deals, to effectively be "Donald Trump." He had zero interest in negotiating the particulars of any deal. Leave the details to the pencil pushers, he would handle closing. He succeeded by staying at 50,000 feet -- only swooping in to exert his unique sort of pressure and influence.
Mueller has made a career out of meticulousness. In any investigation (and don't forget that Mueller was the head of the FBI for a decade) the details matter hugely. It's in the details where well-crafted stories break down. It's in the details where mistakes are made. It's in the details where inconsistencies emerge.
So while Trump blusters on Twitter about alleged corruption within the ranks of Mueller's team, the special counsel silently gathers details and more details. And that makes Trump mad. Really mad. Because, big picture, he deeply believes he had nothing to do with collusion or obstruction. Mueller, Trump thinks, is missing the forest for the trees. Manafort wasn't even working for Trump when he allegedly made a bunch of illegal financial transactions! George Papadopoulos was just a guy who got coffee! On and on it goes.
But Mueller is just gathering facts and details -- and seeing what they add up to.
The Point: Trump is impatient and doesn't want to wait. Unfortunately for the President, he's not driving this car. Robert Mueller is.