To become a professional means to attain a high level of skill, knowledge and competence in one's field through education, training, experience and dedication. Full definition
I had zero intention then of becoming a professional artist — or even of being an artist at all. (creativeboom.com)
These «kids» are certainly taking risks, as many do when they take a non-traditional route to becoming a professional in services outside of being a doctor, lawyer or accountant. (inc.com)
Additionally, pet owners who may have considered becoming a professional dog trainer themselves can gain from teaching their dog new cues. (animalbehaviorcollege.com)