When does the abstinence from cutting hair and nails end when sacrificing through a charity?

The scholars differed regarding the ruling on cutting hair and trimming nails for one who intends to offer a sacrifice (udhiyah). Some of them consider it disliked (makruh), and these are the majority. Others consider it forbidden (haram), and these are the Hanbalis. What is prescribed for someone who has appointed an agent for the sacrifice is to refrain from taking anything from their hair and nails until the sacrifice is completed on their behalf. If it is difficult to know the exact time of the slaughter, then it is advisable to be cautious and refrain until one is certain that their sacrifice has been slaughtered, so as to clear their conscience with certainty. Some scholars, like Ibn Jibreen, went to the opinion that it is permissible to take from the hair and nails as soon as the time for slaughtering enters in the country where the sacrifice is offered, even if the slaughter has not yet taken place. The summary is to wait for certainty of the slaughter according to the opinion of prohibition, while the matter is easier according to the opinion of dislike.