How do I EQ a breathy female vocal in a small live room to avoid feedback?

Start with a high-pass filter around 100Hz to cut foot thumps and HVAC rumble. Cut a few dB around 300-400Hz to remove mud. Gently boost a shelf at 4-5kHz by 3-4dB for air. If feedback occurs, find the ringing frequency (likely 200-800Hz or 1-2kHz) and notch it out with a narrow Q.