Methods of servicing a well bore using self-activating downhole tool

A method of servicing a well bore comprising:

• deploying into the well bore a zonal isolation device operable to self-set at a sensed location;
• self-setting the zonal isolation device to hold at the sensed location without receiving command communications from the surface;
• deploying a perforating gun into the well bore after the device is set;
• firing the gun to form a set of perforations;
• and
• pumping a servicing fluid down the well bore to a location above the set device;
• wherein:
• the zonal isolation device is deployed along at least a partial length of the well bore via an external force;
• the device seals the well bore at the sensed location;
• the servicing fluid is a fracturing fluid;
• the fracturing fluid enters and fractures a formation via the set of perforations in the well bore;
• and
• wherein deployment of the gun is stopped when a spacing component engages both the set device and the perforating gun.