That's pretty much true, you can only be scared when you are doing something wrong or when you are not putting in your best in the business. Like i remember back then when i was still learning, i was always worried when my boss was around but later on it did not bother me.If I am doing everything right when it comes to carrying out my job, I don't see any reason why I should be afraid of my boss or even supervisors at any point in time.