It’s hard to know what impact a new manager will have. It depends if the players like him and take on board his ideas quickly.
Michael Carrick took over as an inexperienced manager who had done OK in the Championship, but he’s proved (so far) to be an inspired choice. He’s done well by doing the most basic things;
1. Setting up the team in the formation which obviously suits them.
2. Playing players in their best position - round pegs in round holes.
3. Sending them to play with confidence and on the front foot.
4. Changing the mood in the dressing room by encouraging the players to express themselves, backing them 100% in front of the media and removing any fear of failure.
Utd have good players who, as a result, are playing at the level they should be. He got them there from game one.
Spurs have good players too.
Spurs are well beyond the point of it being just down to managers.
These players aren’t very good and can’t handle adversity. Weak mentality. He’s known for being confrontational, these players will probably cry rather than be inspired.