Did you know,
“It is recommended for a person who has made his clear intention to offer the sacrifice to observe” certain “restrictions from the beginning of the month of Dhul Hijjah until the sacrifice is made. He is simply required not to take anything off his hair or body. Hence, the restrictions are not to cut his hair or clip his nails.” (link)
As a reference the following is a scan from of the page from the English Translation of Sahih Muslim, Volume 5, pg 316.