Please use the comment or message section to inform your renderer of the do's and don't of your request before arriving and if you're alone, please manually notify your family member or a friend with the service you requested,name of the renderer and if possible the picture too or simply use the share button which is app-in-built.
Ensure the face of the renderer matches what is on their profile and ask who they're here for. Once the picture matches the face of the renderer, verify the pin on their device with yours before proceeding. Cancel the request immediately once you notice if the pin doesn't match.
Intuition goes before you, showing you the way so always trust your guts instinct but if there should be any doubt in your mind concerning the renderer, politely let the requester know and cancel the request immediately without having a second thought before the renderer hits the road to your location.