I was in your position 1 year ago. I left med-surg after 3 years and moved to the ED. I love it, but it was definitely an adjustment. My hospital had a 12 week fellowship program that included class time as well as orientation to the floor. We learned about things we never encountered on the floor such as drips and rhythm strips (my biggest fear). Make sure you get with an experienced preceptor who is willing to teach you. My best advice is when you start down there, keep your ears open. If I heard someone had a patient who was going to be paced, or get clot busting agents, etc., I tried to be in the room as an observer. Depending upon the area you're in, you may not get those too often, and at least you'll have some idea when you get that patient for the first time. Always ask for help when you're unsure of something. I still have things come up that I need help with, and most of my co-workers have been great. It's a great learning experience most days. Good Luck with your interview.