From what I've seen with dogs I've entered, I think it's best to just get them out, showing them earths, showing them quarry, showing them digs etc. etc. and just getting used to general things like being close to the dig and near the spade, IMO putting them back in the kennel to ''think about it'' for a couple of months would be a totally backward step and not something I would do, if a pup wasn't interested I'd just keep persevering until he decides he's ready.