"The essence of acting is to be present, to be in the moment, and to be real."
Efficiency is doing things right; effectiveness is doing the right things.
If you love your work, you'll be out there every day trying to do it the best you possibly can, and pretty soon everybody around will catch the passion from you — like a fever.
I don't think you can ever do your best. Doing your best is a process of trying to do your best.