Health and Safety

Before I start my filming I need to take health and safety into consideration to ensure that none of my talent gets hurt.
I am filming inside a theatre which has been booked out, so I don't need to worry about other people being at my location whilst I film.
However, in order to create the effect I want I need to turn the house lights off, which means the space will be dark. Therefore I need to make sure that my talents knows exactly what they are doing and when to prevent accidents.
The microphone lead is also a potential problem as someone could fall over it. Once my space is set up I will make certain that it is clearly marked so that my talent know exactly where it is which should avoid any problems.
My final problem is that my talent could walk or jump into one another whilst filming. In order to prevent this I am going to have a quick run-through with them when they first arrive so that they are aware of their own and other people's spacing to avoid any collisions.