Think outside the box; not every patient is a healthy, 75 kg man. Think about different age groups (e.g. infants, children, and the elderly), different cultural groups, and various ‘at risk’ groups (e.g. pregnant women, alcoholics, and immunosuppressed patients).
Make an effort to learn details and different options for assessment and management, but always apply this knowledge to the situation at hand. What will YOUR management be, in YOUR hospital? Which option do YOU prefer, and why? If there is a local protocol that prescribes a different course of action, consider whether this is a reasonable alternative, or whether perhaps there is a need to discuss a change of the protocol at your institution.
For any particular presentation, do not be satisfied with simply establishing what the diagnosis is, and initiating its management. It is an important part of a specialist level approach to Emergency Medicine to always think about the potential causes of a condition, as well as seeking potential complications that may occur. Some call this the 3 Cs of Emergency Medicine: Case-Cause-Complications.