Welcome to the forum Wudswise,
Yes, it’s a very important step to learn but not usually necessary when assembling a watch after cleaning if the balance was in beat before removing it. You’ll find beat setting covered in the Staffing video #4. When you start the video take a look in the Quick Navigation window in the video control panel and click on “Set Beat” and that will take you straight to it.
Enjoy Wudswise,
Bob