I'm pretty new with the LGD thing too, and I have the same situation as Ray - dog LOVES goats, goats HATE dog. Pretty hilarious watching my a little yearling Nigerian whirl around and charge the LGD - and funnier still when my Great Pyr lgd tucks her tail and scoots out of the way!
What I've read is yes, the licking is normal and should even be encouraged. As far as leaving the dog alone with the goats - hard call. My LGD is 10 months old, and I feel comfortable leaving her in with the adult goats. She still will sometimes chase after the goats if they run, though she will stop if they stop. The older goats have figured that out, and also that they can boss her around so I don't worry about them. They youngsters though get scared and keep running, and the dog is still enough of a puppy for me not quite to trust a 100% unsupervised.