1) Speak loudly & clearly
It is always crucial to be wary of this point whether you are a new tour guide or a seasoned professional. Your guests need to hear you properly so that they can digest the information and remain engaged. A small group size is always the best for a tour as it allows you to pay close attention to, and manage the guest experience. However, if you have a big group, consider using headsets so that everyone can hear the information you are providing.