As an admin, I'd like to turn on lightning right now, for myself, to become acquainted with it. How can I do that? (it is enabled for all profiles in my org). Then, I'd like to find a user in my org who is more comfortable with change and turn it on for them and work with them on any issues they have. But when I go into my settings and look at the transition assistant, it appears I'm on a path to turn it on for my entire org at the same time. Right now, I'd just like to turn it on for myself, then proceed to my more sophisticated users.