What's actually happening
A First Quarter Moon occurs when the Moon is ninety degrees ahead of the Sun in the zodiac, producing a waxing square. The Moon is half-lit from Earth's perspective — the point when initial momentum meets its first real friction.
For a First Quarter in Pisces, the Moon is in Pisces while the Sun is in Sagittarius. The tension is between the receptive, formless quality of the Moon's position and the directional, expansive quality of the Sun's.
What the tradition makes of it
First Quarter Moons are crisis points of action. What was planted at the New Moon now faces the first genuine obstacle. Pisces brings the capacity for non-linear movement to that moment — the intuitive sense of where the opening is rather than the analytical identification of it.
The tradition reads this as a moment that can feel disorienting precisely because the usual tools of the "crisis of action" — force, analysis, planning — are not what is called for. What is called for is a different kind of attention.
How to actually use it
Release the attachment to the specific form the commitment was supposed to take and allow the intention behind it to find its own way forward. A First Quarter in Pisces rewards the willingness to follow the thread intuitively when the plan has hit a wall.
The shadow is the formlessness that abandons the intention along with the attachment to its specific form.
When in doubt
Ask what the commitment would look like if it were not required to take the shape you originally imagined — and whether that new shape still serves what you actually want.