Giving a Tutorial using MS Teams

I want to use MS Teams to give a demonstration of how to use a feature in MS Teams in a live meeting. I want the attendees in my meeting to be able to see my screen and to see the actions that I am taking. I understand that I can do this using screen-share but I do not understand how this works. Do I need two devices to do this? I know many people do tutorials showing how to use MS Teams and I wonder this can be done in a live meeting. Can someone help me with this please?