Good Job! Congrats! What I have always done is cut the bottom jaw with a hack saw and clean all flesh and hair off and let dry out good! I only do it to the ones Iwant to keep, they have to be good ones.
After they are dried good, go over them with some clear varnish to hold the teeth and tusks in place. You can then mount the whole jaw or jaws on a Plaque to hang on the wall.