Just make sure that when you give a shot you get good control of the head. Most people are not prepared for how strong their snake is and get freaked out and let go. Good way to get tagged on the hand. When you get them under control, just slide the needle at an angle facing toward the front of the snake under a spot where the ventral scales meet the side scales. Pull back slightly on the plunger to make sure that you are not in an arterie and push gently on the plunger.