It would be really helpful if people who promoted FPV flying would share the Academy of Model Aeronautics guidelines for flying. This is the main group for RC Aircraft hobbyists and "professionals" that works with the US Congress, the FCC and FAA to make sure amateur and hobbyist use of RC Aircraft is not outlawed (which many have tried do). They have done extensive work in both the legislative and regulatory arenas to make sure you can still legally fly RC aircraft in the US.
Here are their guidelines for FPV flying:
Following them will help make sure RC flying of all types stays legal. The biggest guideline that people ignore is that it is currently legally required that you have to keep your aircraft in your line of sight at all times.
I know people disagree with the AMA guidelines, but really they are the best out there and are pretty much focused on safety and keeping the hobby legal in the face of a lot of folks who want to out right ban it or regulate it out of existence. No other organization has done as much to make sure you can still legally fly RC aircraft of any type.