If you're motivated enough to do it, you can do it. You have experience in a wide variety of areas, so that will definitely help. However, ER nursing is unlike any other type of nursing. You have to prioritize far more than in any other field of nursing. You can have four critical patients all at once. You must prioritize their assessments and interventions, as well as getting those things done in a timely manner. The name of the game in ER is treat em and street em. We aren't here to hold patients. Never plan on that happening. Does it happen? Yes. But your plan of care for that pt should be stabilizing and moving, whether it's to the floor or out the door.
It can be a rough place to work.
You'll have days where you feel completely out of your element and that you're in a hole you can't crawl out of. In one shift, you'll see the entire spectrum of the patient population, from peds to geriatric. You have to be prepared for everything that can happen and take care of everything that has happened. Sometimes you'll just look at your orders and struggle to find the willpower to complete the daunting task in front of you. You'll have patients that cuss at you, question your competency, and even try to swing at your head. You'll have doctors that treat you like you're inferior, you'll have nurses that treat you like an outsider, and you'll have patients complain about you.
But then, you'll have those days where you're on your A-game. Those days where you can do no wrong. You hit every vein the first time, catch something before the doc does, and have your intuition lead you to saving someone's life. You'll have patients and their families give you a heartfelt thank you and give you compliments you thought you'd never hear. You'll have doctors trust your abilities and know that when you're taking care of their patient, they don't have to stay on you to get that patient taken care of. You'll have other nurses help you out and develop a camaraderie with you that you can always count on.
No matter what day you're having in the ER, you must do this: always move forward. At the end of the day, no matter what day I've had, I alway love my job. This is an area where you love it or hate it. And to be successful, you must love it.