In my business we are required to take training on a number of subjects throughout the year to instill that we keep up with procedures, disclosures, and products.  I'm constantly brushing up on my knowledge to make sure that I'm on my game when needed.  One thing that I am not afraid to say is that I don't know everything and an endearing quality of mine is that I'm not afraid to tell my customers when I don't know the answer.  That's not a problem though because I know who to reach out to when I need to find an answer.  My customers respect the fact that I'm upfront and honest with them and know that I will do everything I need to do to have their questions answered.