So once you find a nest, you have a couple options. You can throw fertilized eggs as a distraction for the mother, or you can aggro her off a cliff or so where she can't make it back, then deaggro. Mother only targets one egg at a time between checking her nest, so if you use the egg route, throw one at a time. A pile of eggs doesn't distract longer than one egg. Once mama is busy and deaggrod, go interact with the nest (same key as mounting) and wait for the baby to come back and make noise. A mini game with 3 emotes (spin, bow, flap arms) will appear and you need to hit the key that matches to make progress. If using the egg method, one imprint is usually all you'll get between eggs, depending on size I believe.