As you have to get the disbudding done by a vet anyway it is just as easy to get him/her to slip on the rubber ring too.... yes the boys feel a bit sore, but usually not very long.
More difficult to do it yourself - you would only need that if you had a polled male. If you were to decide to ring them yourself it would be best if you could get to a lambing course in one of the Agri colleges. Lambing and kidding are very similar anyway, and lambing courses normally cover castration too.