My vet has been extremely busy so has only now got round to my lamb castration.
She recommended the Burdizzo rather than the knife. Its quick, easy and no risk of fly strike or wound infection. So I held the lambs while she did the deed, it was quick, about a minute each testicle. Lambs gave a couple of kicks when the clamp went on, relaxed while it was on and fine when it was released. A bit subdued for an hour but then back in the field having a nibble.
I’d have no qualms about this method in the future, if I ever get caught out again.