There does seem to be a difference between saying that you do something and saying that you are something.  Though the word’s definition may not require it, most feel a bit hesitant to describe themselves as something they are not quite proficient in.  That is, something that doesn’t truly describe a portion of who we are, perhaps beyond the craft itself.
I have taken martial arts for 25 years and have studied many styles.  However for a great deal of time I would have described myself as a student or say “I take martial arts”.  However at this point martial arts has affected who I am, how I view myself, and how I view the world.  I can say with pride, I am a martial artist.  
So though I may technically be a bowyer, having made bows, I would not yet describe myself as one.  I hope that someday this passion will have affected who I am as a person in a profound way.  I will then describe myself as a bowyer.   
