This article is so general, that it didn't even need to be written.
Sorry it wasn't able to help you at all. I gave specific examples of how confessors usually determined everything. Yet, every person if different. So, they are more guidelines than actual rules. This is why people have to discern their vocation. If it was all black and white such would not be necessary. Yet, we know from the lives of the saints that discenment is necessary.
God sometimes likes to keep a person guessing for awhile as to what their vocation is so instead of focusing on it they can ficus on growing in virtue first.