You must sell to the prospective employers the fact that you know how to conduct yourself.  In other words, you must convince him or her that you will get the job done in the manner of a professional who is aware of the importance of:

BEING PREPARED:  This means knowing your skills, consistently striving to perfect them further and knowing the needs of the job.

BEING FLEXIBLE:  This means keeping an open mind toward all learning experiences on job interviews, on the job, and being willing to accept constructive criticism.

BEING RELIABLE:  This means keeping appointments, being on time and following through on directions.

BEING CONFIDENT: This means believing in yourself, your abilities, and what you are doing.  You have to believe in yourself before other people will believe in you.