Big smile and feel comfortable with them even if you stutter a lot in the moment.  Bigger fun loving chill smile.  Theyre all human, it is what it is.  No one actually cares what you say. If you know what to do, great, even if you will learn on the job, people just wanna know you're a nice guy to work with.  They just wanna be comfortable among their employees.  Remember, no one really cares what you say!  Believe in yourself or how can you expect anyone else to was always my guiding light.