I also dont trust myself shooting at walking deer. So I ' Maaaaa' with my mouth when they get in range if the deer are walking. I do this very softly just enough for the deer to hear it. If they dont stop I bleat louder. Usually they freeze sometimes even with one foot in the air. But you better already be drawn and aiming and shoot as soon as he stops. And if they go on by without stopping I will grunt and sometimes they come back.