The race is not always to the swift, but to those who keep on learning. If you do not take time to do this, they will not appear in the same time frame. The longer the time lapsed since you checked your e-mail, the more likely you are to have a message which required immediate attention. The piece of equipment that worked perfectly during setup, will always malfunction during your most important presentation. No matter how long one works on a computer with a student, the computer will malfunction the instant the librarian leaves the student's side and returns to the reference desk.
Verbal explanations are worthless.
Do it, make errors, and do it again until you get it right. The challenge to the library is to add value to information access. One such commodity would be instruction and training. The job is what you make it. That was for practice.