It would be a manual about the parish priesthood. "Pro-tips for Parish Priests" or some sort of thing. It wouldn't be a spirituality of the parish priesthood. It wouldn't be a theology of the priesthood. Just considerations related to the professional work and life of the parish priesthood.
I can see part one being the plan of a parish priest: daily; weekly; monthly; yearly; always. I can see another part being particularly parochial responsibilities: sacramental, catechetical, juridical. I can see another part being an assortment of particularly useful virtues, skills and best practices.
If it were called "A layman's guide to the parish priesthood," then, as ironic as it may sound—in that the book would be firstly for priests and not laymen—that would still actually be the tone.
