Group fitness barre/mat Pilates instructors: how to practice

This is a question for group fitness instructors who teach barre and or Pilates or yoga sculpt style classes. I’m new to teaching after completing in person training. I may begin teaching a fusion class using some Pilates principals and some barre moves. I want to practice how to build my sequences in a way that makes sense but i notice it requires me a lot of time and effort from my own body to practice them out on my own. When you first started teaching, how much practice did you do on the flow of the class? Or did you just did what you felt made sense in the moment? Am I over thinking it? I want the transitions between series to make sense. My training did teach ways to do this but since I’m creating a blended class some of those don’t make sense since it was from my barre training and does incorporate some higher intensity segments and I’m looking to add a few more classical Pilates segments core work. Appreciate any tips on how you practiced and build your class sequences. I also wonder how many hours a day do you practice and can physically do so much movement? Did it impact your calories burned/diet choices and your own workout routine? I did a hard lift session today and am quite sore already and tired and even practicing a few segments of my class ideas felt like it was too much. Thanks for any advise!