Shygirl, i had two rams turn up on my property they came through the forest and were about eight months to a year old. I had another two that had not been properly desexed with rubber rings. I got them all castrated by the vet - took them to the clinic, but at that age was full anaesthetic, heavy painkillers and sad boys for a number of days. It was like a dog being speyed - quit tough on them. But worth it they all got through fine. They had all been getting pretty rough, i was a bit worried about them behind me, and that all stopped, and now they are the gentlest sheep ever. Another was done at about four months, local anesthetic, antibiotics and painkillers much less traumatic at that age, but only can be done by a vet.