Banish call reluctance by practicing your script out loud. Read it in front of a mirror. Become completely familiar with it. Practice until you can speak without hesitation. If there are parts you are uncomfortable with, reword it until it feels right.
Role play with a friend or family member.
Ask them if the presentation makes sense. Encourage them to ask questions. Practice your answers. Ask them questions and listen to their answers. Formulate your answers using their concerns and how you can help.