Is this an avian vet? If not, is this a vet with bird experience? Timber was very aggressive and upset when I first got him and started taking him to have his nails trimmed. I was amazed at how calmly the vet and tech toweled him up and trimmed his nails without getting a bite, because he was giving it his best shot. I don't know your situation, or your bird, so can't give advice, but anesthesia is tricky with birds and I'm not sure a nail trim would be worth the risk?