Yep, it’s super easy! I’m a single woman, who is fairly handy and can figure stuff out and have been slowly renovating my house by myself, but replacing the toilet intimidated me so I just turned the water off for like 2 months and used a different bathroom lol. Untill final the other day I just did it. Watched a video, got a new toilet. Replaced it. Honestly easiest diy thing I’ve ever done. A plumber is absolutely not needed for this unless there’s an issue with the water line coming in. It was comical how easy it was!