He makes me lie down in green pastures. He leads me beside still waters. Even though I walk through the valley of the shadow of death, I fear no evil. We need a simple trust in God. A second thing that helps us follow our shepherd is the ability to recognize our shepherd's voice.
Sheep are kind of remarkable.
When shepherds come in from the fields in the evening, several flocks may all come and drink out of the same watering hole. Six, seven, ten flocks may all mix together around the water. Each sheep recognizes its shepherd voice among all the other voices. It hears and follows. The sheep recognizes the voice of its shepherd because it has spent a lot of time with the shepherd.