Moving to the NCLEX Forum.
I wouldn't say so much "dummy down" as that you have to approach NCLEX scenarios and questions from the RN/LVN scope of practice, instead of the EMT or firefighter scope. You may have been permitted to do things in your past lives that are now outside of your scope of practice as a nurse. Also, in the field, you might do--by necessity--things that might not exactly fly in a facility or on the NCLEX..
Similar issues happens with CNAs/PCTs/other hospital employees becoming nurses or LVNs becoming RNs--they're used to working (and for LVNs, nursing) in the real healthcare world, whereas the NCLEX is set in the ivory tower world of nursing. You know, that perfect little world where you have one patient, all the resources you need at your fingertips, all the time in the world for your patient, and your patient responds predictably to every single intervention.
It can be hard to keep real world and NCLEX world nursing separate, especially during the test: your gut screams "A" because that's how you've actually handled it before, but in the NCLEX world of nursing, the answer is "B."
Check with your BON to see if you are still eligible to take the NCLEX as is. At 7 years out, you may not be able to take it without either re-enrolling in school or taking a refresher course.
Get the most recent study guides that you can. Do lots of NCLEX questions so you become very familiar with them. If you are weak in a particular area (e.g., pediatrics, pharmacology, etc.), also pick up review books in those areas too. You could consider a NCLEX review course such as Kaplan. They review content as well as test-taking and question-answering strategies. Or even consider enrolling in a refresher course, which will review content as well as clinical skills.
Best of luck.