It is absolutely a completely different environment with completely different priorities. I have precepted some nurses who have come to the ED from other specialties. Some suggestions:
Focus your assessments on the chief complaint. If it's an ambulatory asthmatic having an exacerbation, it's not important what their feet or their backside look like ... just CXR, steroids, neb tx ... disposition.
You can assess & get history & screening questions while
starting a line & getting labs.
Food & drinks are now optional and only for those patients who have a diagnosis, disposition, and are not NPO ... so take that out of your vocabulary.
Never waste an opportunity to obtain bodily fluids, ha ha. Ambulatory patient asks where the rest room is? "Here, let me give you a cup just in case we need a urine specimen at some point."
It takes a little time to adjust from the "this is my team of patients for the day" mindset to the revolving door of the ED.
And ask your preceptor(s) for specifics on areas in which you can improve -- this demonstrates your willingness to accept constructive feedback and ensures that they have an opportunity to meaningfully contribute to your progress.
Welcome to the dark side ... keep us updated on how you're doing!