Laser 'n' Lights holds public liability insurance only if Laser 'n' Lights delivers, sets up, pulls down and returns equipment.
You should seek your own insurance if you want DIY hire.
Laser 'n' Lights will not be held responsible for any injuries or accidents resulting in DIY equipment hire.
All breakages or damage to equipment is the responsibility of the person hiring the equipment. In other words if you signed for the hire you are responsible for making sure the equipment is returned undamaged.
Or you pay for it.