"That depends on the situation, of course. For example, getting arterial blood gases can be part of a routine diagnostic approach, or it may be time-sensitive. Things like intubation are always an emergency, and failure to accomplish it not only deprives the patient of its benefits--getting oxygen and preventing aspiration -- but can also traumatize the airway with inflammatory swelling or bleeding, which can cause morbidity later. In situations like this, I owe it to my peer to allow a trial of the procedure, but when I see the patient is in jeopardy because of failure to accomplish such a life-saving procedure, it is my responsibility to politely request to try. For a simple procedure that a peer was struggling with, I would take time after our shift to see if they want to learn about it more."