Cutting of Nails and Hair During The First ten days of Zul Hijjah

Question: Am I not supposed to cut my hair or trim my nails during the first ten days of Zul Hijjah?

Answer: Yes, the one who is going to be doing Qurbany of his animal should not trim or cut his hair until  he completes his Qurbany. If he did not cut his nails etc for forty days prior to Zul Hijjah, and the 40days will fall in the first ten days, he must then cut his nails and hair. Leaving it to grow for more than forty days is sinful.