Kindly refer to the following link(s):
Cutting hair from all sides or Shaving the head for Umrah?
It is best to shave off head completely by men, as Prophet peace and blessings be upon him made Dua three times for the head shaven people and once for those who take hair around their head. (website)
Cutting your hair by yourself or by others
Is it mandatory to cut or shave hair after Umrah, in Makkah itself?
Cutting or Shaving the hair in Jeddah after Umrah
Cutting the hair only from the sides after completing Umrah
How should a woman cut her hair after Umrah if she has layers?