Mounting screws must be used. Failure to do so can result in the oven falling out of the cabinet causing serious injury.

Wood Screw for Mounting (4X25) (2 ea)
Rubber Pad (2 ea)
Cabinet Screw Mount (2 ea)

Phillips screwdriver
Tape measure
Drill
Gloves
Observe all governing codes and ordinances.
Have the installer show you the location of the circuit breaker or fuse. Mark it for easy reference.
As when using any appliance generating heat, there are certain safety precautions you should follow.
Be sure your appliance is installed and grounded properly by a qualified installer or service technician.