Is juggling difficult?
Not for a juggler, but someone learning to juggle wouldn’t want to perform in front of an audience with bowling pins. The closest personal juggling project to buying-and selling a home on the same day is probably having a wedding. What makes a wedding complicated is the number of professional and personal parties and interests involved.
Real estate and financing a home are governed by a lot more rules, laws, mandates, and procedures than a wedding. There’s also other households (and their children, pets, furniture, and boxes) that are involved in selling your home and then buying the next one.