Are you allowed to take a Haircut The day of Erev Pesach after Burning the Chometz? Does it make a difference if your are a Male or female are small children Different?
As long as it is before Hatzos then it may be done Lechatehilah. If it is after Hatzos then it may be done by a non-Jew.(SA OC 468 1 MB 5)
Under Bar or Bas Mitzvah may be given a haircut after Hatzos Lechatihilah.