How granular should you get with quality of a sign in combo with a planet/angle and the house? How do you weigh all that stuff in your interpretation?
Really good question! First, never lose sight of the sign a planet is placed in, even if you’ve got some problem with the sign.
“Hey! I don’t want to be a Virgo. I’ve got Pluto in Virgo with my sun and blah, blah, blah, so really I am not a Virgo, I am a….”
This is a common thing to do and it’s incorrect. If your Sun is in Virgo, you’re are going to have to serve, make others look good, fix messes and so forth. The sign a planet is placed in is the first thing to consider.
Next take the house. If the Virgo Sun is in the 1st house, the person is a leader. The Sun in Virgo in the 1st, is a do-gooding leader, see? A person who can rally the troops, organize a blood drive and so forth.
Put the Virgo sun in the 8th house and you have psych or a trauma nurse. 11th house, Virgo? Maybe this person does the books for their astrology club or the like. In all cases note that service is involved.
Next, consider the aspects. If Jupiter trines that Virgo Sun, the ego (Sun) is expanded (Jupiter). This would give you a confident Virgo, working in whatever arena shown by the house.
If Pluto is conjunct the Virgo Sun? Intense Virgo. Powerful Virgo.
If Mars squares the Virgo Sun? Angry, energized Virgo.
You get the idea.
Now tell us about your Sun, it’s sign, it’s house and it’s aspects…