If one has a sacrificial animal and intends to sacrifice, but then it becomes clear that he will perform Hajj when the first ten days of Dhul Hijjah enter, is it permissible for him to shave his hair and trim his nails?

The Shaykh : 'Abid al-Harbi: If a person has a sacrificial animal for himself and his family, and Hajj occurs for him after the first ten days have entered, should he take from his hair and nails when entering the state of ihram? And how should he handle his sacrificial animal? Should he slaughter it in Makkah or appoint someone to do so?
As for his sacrificial animal, if his family are here, meaning they are not traveling, they should sacrifice in their location, and the hady (sacrificial animal of the pilgrimage) is sufficient for him. As for the matter of taking from the hair, taking from the hair and nails is not a recommended practice (sunnah) when entering ihram, unless there is length in them; in that case, yes. And if it is not a recommended practice, it does no harm if he leaves it.
The student: ...

The Shaykh : How?
The student: ...

The Shaykh : No, I tell you, he does not take, he does not take. But when exiting the state of ihram from 'Umrah, he shortens it. Did you understand? Yes. And I mean, I told you, this is for the sake of increasing knowledge, that there is no recommended practice (sunnah) indicating that a person should trim his nails and take from his hair when entering ihram, unless they are long. And you know that the Messenger (peace and blessings be upon him) set a limit for the nails, the pubic hair, the armpits, and the moustache, that they should not be left for more than forty days. Yes, correct.