What is "workmanlike manner"?
Workmanlike manner is a really subjective term. It is a catch all for neat, orderly and following the rules. A lot of inspectors fail an inspection using that term when actually specific violations are numerous.  Common items such as not securing wires close enough to plastic boxes, crossbeaming, sagging cable, holes drilled too close to the edge of joists, lack of nail protection plates, bla bla bla.  Typically a lot of the look nice, finish up work can fall into this category. If your work looks neat, tight, and orderly, you should be fine. If the inspector finds some minor problems, thank him or her for pointing them out and if small enouth, fix them while they are still there. Debating with an inspector is futile and will invite a much more intense evaluation that could result in a lot more findings.  Ask them for advise and treat it like a learning experience.  Good Luck.