be efficent and effective....like an assembly line

Today was my first day as an assistant in housing.  I was given lots of little projects and I am pretty sure I completed them all very well, but i do worry that because I worked so diligently to accomplish them fast I may not have been efficient or effective enough.  Therefore today's resolution is to be efficient and effective on all task given to me.  I need to make sure I give 100 percent and not leave my boss asking why i may have missed  a step.  It is always very good in the business world to be one step a head of your employer and although I DOUBT this will happen with my new boss because he is CRAZY on his a game...it will be helpful for me in order to still play in the same ball park.