Gary,

However, words such as 'hobbyist' or 'amateur' are sometimes used to suggest
a superficial level of competence, in contrast with the presumed expertise
of a 'professional'.


The author Robert Littel makes extensive use of the definition of a
professional of someone that is of the opinion that if something is worth doing
at all, it is worth doing well, IIRC.

--
Thomas Borchert (EDDH)