Shaving the hair and clipping the nails are not permissible in the (first) ten days of Dhul Hijjah for the person who intends to slaughter. The person can not even take something of the hair or the nails in the (first) ten days of Dhul Hijjah until (after) the person has slaughtered base on the prohibition of the Prophet (ﷺ) about that which is mentioned in hadeeth of Asmaa (radiyAllah Anhaa). As for combing the hair, if none of the hair comes out then this is okay.