What's actually happening
A Full Moon happens when the Moon stands opposite the Sun from Earth's point of view. The lunar face is fully illuminated. A Full Moon in Aries means the Moon is in Aries while the Sun is in Libra — the two signs of the Aries-Libra axis are lit simultaneously from opposite sides.
This is a geometry of maximum visibility and maximum tension between two poles: the individual and the relational, the assertion and the accommodation.
What the tradition makes of it
Full Moons are culmination points. What was seeded at the New Moon has enough light on it to be seen and sometimes confronted. Aries adds urgency and directness to that visibility. What has been building — the impulse that has not been acted on, the assertion that has been deferred — arrives now as something that can no longer be held inside.
The Libra Sun wants balance and consideration. The Aries Moon wants to act. The tension between them is the productive material of this phase.
How to actually use it
Notice where the impulse toward direct action has been in conflict with the need to maintain relationship or fairness. This phase tends to illuminate that tension clearly enough to allow an honest response to it.
The useful question is not "how do I get what I want" but "what does the situation actually need from me" — and whether the answer allows genuine action.
When in doubt
Ask what you have been deferring in the name of keeping the peace — and whether the deferral has been serving the relationship or only postponing what needs to be said.