Clicker training works well with most sheep. Please, don't ask me how I know. As for taking them for walks on trails and stuff. I would not, as there are too many dogs that people take with them that are not on leashes. Your sheep does not have any defenses. But Taming them in the safety of your farm, that would be great. All my sheep were halter trained and trained to be easily lead around once caught. They are much easier to deal with when they are tame.