Users should be grateful for whatever they get. They are lucky to get any program at all. Don't comment their code. If it was hard to write, it should be hard to understand and even harder to modify. Don't draw flowcharts.
Flowcharts are, after all, the illiterate's form of documentation.
Don't read manuals. Reliance on a reference is a hallmark of the novice and the coward. Don't use Cobol. Don't use Fortran. Fortran is for wimpy engineers who wear white socks and smoke a pipe, stress freaks, and crystallography weenies.