This job is a learning curve. It took me , weeks, months even years to perfect my screening on clients.
When you are new, people WILL try to take advantage on absolutely everything.
ALWAYS make sure someone knows where you are, and when, and who you are with.
Make sure the client sees you texting/calling someone on your arrival and have 2 phones with you.
Try to put on your ad that you are an experienced escort that should help in weeding out the timewasters.