What's actually happening
Mars takes roughly two years to complete one circuit of the zodiac, spending an average of six to seven weeks in each sign during direct motion. Virgo is a mutable earth sign ruled by Mercury.
What the tradition makes of it
Mars in Virgo is productive effort directed toward correctness. The action is methodical and self-critical — each step is checked against the standard before the next one begins. There is less tolerance for sloppiness here than under almost any other Mars placement.
The tradition associates this placement with the crafts and with medicine — with the application of skill to practical problems, with the willingness to do the unglamorous detail work that makes the larger thing possible. The satisfaction is in the thing done right, not the thing done impressively.
The shadow is the perfectionism that prevents completion. Mars in Virgo can cycle through revisions indefinitely, mistaking the inability to stop improving for commitment to quality. At some point the work must be released.
How to actually use it
Attend to the craft. This is good weather for the revision, the repair, the careful construction of something that will be used rather than admired. Let the standard be accuracy rather than perfection.
The practice is to set a completion criterion at the beginning, before the work begins — otherwise the standard moves.
When in doubt
What does "good enough" actually mean here — and have you reached it?