TNCC is an interesting course and is required to work trauma in many hospitals. It is a bit strange because in theTNCC course you have to think like a doctor, not a nurse. It is sort of a fish-out-of-water experience, but it is interesting and, as I said, increasingly required. If it is required your employer will pay for it. CEN is another thing entirely. Very comprehensive and all of the information is important to know for a professional Emergency Nurse. Most employers do not require CEN so you will have to pay for it and it can be pretty expensive. Preparation is also time consuming and you have to recertify--take the test--every four years to keep it. Is it worth it? I think so, but I know many CENs who don't think so. At any rate it is important to keep learning and improving your skills as a nurse throughout your career if you want to ba a true professional. Good Luck.