Dear John,
I can’t answer your question specifically about discerning the priesthood but generally speaking vocation directors have the job of helping you find your vocation. Any “good” vocation director will have as their goal, not getting vocations for their diocese or community, but helping those who come to them discover what great plan it is that God has in store for them.
I think each person has a different relationship with a vocation director because they have different experiences of God, life, studies, relationships, etc. All of these are ways in which God calls and speaks to us and the job of the vocation director is to be a resource on the way and an intermediary between the institute or diocese and the discerner.
I hope there are some men on here who can provide more specific information in discerning the priesthood. Many blessings on your discernment!