That was my unqualified thoughts, here is an answer from a Mufti
Q: Is it prohibited to cut one's hair in the first ten days of Dhul Hijjah?
A: It is Mustahabb (commendable) for a person making Qurbaani not to cut the hair and finger nails from the 1st of Zul Hijjah until after slaughtering the Qurbaani animal. To observe this Mustahabb act is greatly rewarding. Rasulullah (Sallallaahu Alayhi Wasallam) said 'In lieu of every limb and part of the animal, the person's limbs and parts of his body will be freed from Jahannam (Abu Dawood).
Therefore, a person should try as much as possible to leave his hair and nails uncut in these ten days so that they may be freed in lieu of the nails and hair of the sacrificed animals. However, if the hair under the arms and in the pubic region is very long (which renders the Salaat Makrooh i.e. more than forty days), then it will become compulsory to remove such hair. However, if a person forgets to clip the nails before the 1st of Dhul Hijjah and the nails have grown so long that they may cause injury, then he may clip them.
This cannot be undone and I am sure it will be greatly appreciated.
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