These sources examine the "hypervigilant" customer, a type of homeowner who compulsively observes service technicians due to a past history of toxic stress or unpredictable environments. Rather than acting out of distrust, these individuals possess heightened nervous systems that equate constant monitoring with physical and emotional safety. The text identifies a common professional pitfall: a technician's silence or focused expression is misinterpreted by the client as a sign of impending bad news. To manage this dynamic, the author suggests a technique called narrating, which involves speaking internal thoughts aloud to fill the information gap. This proactive communication de-escalates the customer’s anxiety, fostering a sense of transparency that builds deep professional loyalty. By understanding the psychological roots of vigilance, technicians can transform a potentially tense encounter into a long-term service relationship.