I have been a nurse 34 years, work ER in a very busy, 52 bed trauma/referral center, and my advice is to start slow if all other things are fairly equal. Why kill yourself, set yourself up for failure or at least misery if you don't have to. Would you send an infant to kindergarten and expect it do well, or would you start by teaching him how to walk and talk first.
Nursing school does not teach you to be a nurse. It gives you the opportunity to learn how to be a nurse. Patients are sicker than ever before (they used to die sooner), hospital stays are shorter (only the sickest are allowed to stay, everyone else is kicked home to recover), technology is more advanced than ever and changing quickly. Computerization may make your documentation look better, but it slows things down in the ER.
The chances of getting sued or even charged with a crime if you make a mistake are greater than ever before.
When you are young and energetic and want to change the world, the tendency is to jump into everything with both feet to experience the thrill of the chase, the trauma, the drama. But, I have seen too many young, bright nurses burn out and leave nursing completely.
Trauma nursing is tough to learn even as an experienced nurse. I have seen nurses with 10+ years in another specialty struggle in the ER. It is a different world that changes minute to minute. You may be dealing with mundane flu symptoms, belly pains, and lacerations one minute, and next thing you know you have 3 patients with multiple gun shot wounds, or multi vehicle MVC with major trauma fly in and take the rest of your shift. You have to be ready to go with the flow and be ready for the constant change.
Lots of us say we like change, and that is what keeps ER fresh and interesting. But you must have your assessment skills, judgement and generaly maturity down pat before you can truly succeed and feel comfortable. Many trauma centers are staffed with lots of medical interns and residents who are also learning how to be physicians. You as a nurse will have to be SURE when something is ordered for you to do that it is safe to do so, that you are not causing harm. It is your responsibility to give safe care, even if you have been asked to do something unsafe, or give an inappropriate med. That DOES happen, you will be held responsible for your actions.
Sorry for running on and on, but I just hate to see new grads dumped into situations that are not good for them and not good for the patients they care for. So, why not learn to be a nurse first, then learn to be a trauma nurse. Just this old nurses opinion. It is probably worth what you are paying for it!