I have been considering learning safrut from an individual. I know 2 sofrim in my area, but not well. I understand that learning this skill takes much time and this will probably be a significant monetary as well as time investment, so I want to ascertain that I am getting good value and am learning things properly.
When I interview a prospective mentor, what qualities and types of questions should I ask him so that I can evaluate that this person is well qualified as well as knowledgeable to teach me properly? Obviously, he has to know the halachot, but as I don't know all of them myself, how could I verify that he knows them and demonstrates this in his craft? (I am not talking about interpersonal communications, as that's a separate issue that I may not know until later)
Additionally, is there a different set of standards or questions that I should ask him if I am learning to write tefillin / mezuzot vs. inspecting & correcting others?