The observance of the fast of the ninth of Zul-Hijjah is a atonement of the past and coming year, and to remain awake on the night of Eid and perform Ibaadah is a source of great virtue and thawaab.
Rasulullah salallahu alayhi wasallam said:
“When the ten days (of Zul-Hijjah) begin and a person has an animal for sacrifice which he intends to slaughter, then let him not cut his hair or trim his nails.” (Muslim)
Rasulullah salallahu alayhi wasallam said in another Hadith:
“Whoever has an animal for slaughtering, once the crescent of Zul- Hijjah has been declared he should not cut his hair or trim his nails until he has sacrificed (the animal)” (Muslim)
It is a recommended act due to the Hadīth. However, if one did cut his hair and/or nails during the first ten days of Zul-Hijjah before sacrificing, it will not affect the validity of making Qurbānī.
Please remember me and my family in your Duas.