1. Always take a few condoms to an appointment, you don't want to be one of those guys telling the story of how you showed up and the chick says "oh I'm out of rubbers, so we can't fuck sorry." Though I'd expect any provider on here to either keep stocked or let me know I'll need to stop and get some when I say I'm headed out.
2. Let someone else see a provider first. I know if every guy here followed this rule this site wouldn't exist, but letting someone else see a chick lets you find out info like how she is at scheduling etc.
3. Give second chances. If a provider flakes I know how it feels to want to run to the boards here and blast her to vent your frustration, but there are valid reasons she NCNS. Maybe her kid got sick, or a family member was in an accident and she rushed to the hospital, or she simply knocked her phone into the toilet and that was her only means of communication. If you have an appointment that was a let down, maybe see her again before posting a no review or otherwise saying she's a boring lay. She could have a million things on her mind at the time so she isn't as focused as she was when other guys saw her that prompted them to give her a glowing review. We all have shitty days at work where we can't seem to do anything right or nothing seems to go right, providers experience that too. Give her a chance to make it up to you before reviewing her or sharing info that she's a subpar provider.
There's obvious exceptions to the give a second chance rule, but I don't think I have to name them. I like to apply the idea that you shouldn't form an opinion of something till you've tried it twice to my life, even the hobby.