Managing Manchester United is difficult, but too many of those to have tried in the last 13 years have made it look the impossible job. A few weeks into his tenure, Ruben Amorim had declared his side were possibly the worst team in the club’s history. A few months into what had seemed an interim stint, Michael Carrick appears entirely at home. Carrick has never fully announced his candidature to succeed Amorim on a permanent basis, but he may never need to. The audition has been suitably successful to make him look the leading man. After beating Liverpool – a fourth major scalp , to follow Manchester City, Arsenal and Chelsea – he came as close as he has to confirming the obvious; that he wants to stay. “I love doing what I’m doing,” he said. “It’s a great position for me to be in and it feels pretty natural, if I’m totally honest.…