If you know any other local goatkeepers find out who they are using, I don't think BGS has any info on this. However most large/farm animal vets should be able to do it, if you an older vet in the practice she will almost certainly have done in the 80's...
My vet does them on day 4 (at the latest - if the are born on a Tuesday it is actually late on Friday that he does them, rather than go over the weekend) But you should be ok up to a week. Speed is of the essence here.
They actually look quite frightening when they come back with those "holes" on their heads, but horns are dangerous, and if you plan to sell the goats at any time later on horned ones don't have the same value as disbudded ones.