The number one tip for cutting hair with the lunar hair care method is to choose a recommended astrological sign for the day of the appointment.
The signs for general all-purpose haircuts are ones that are in the barren class. That means Gemini, Leo, and Virgo, which are all barren. Sagittarius gets high marks with semi-barren as a good astrological sign for haircuts with the moon.
The next popular class is hot. Gemini, Leo, and Sagittarius are all hot. Virgo is the exception, being cold, but is included with these three for its similar quality of Mutable.
By itself, Capricorn is part of this group for its strong number of votes for lunar hair care from folklore and traditional western astrologers. Capricorn is semi-fertile, Cardinal, Earth, dry and cold.