Again, I am enlisted. Please understand that my perspective comes from that angle. There are plenty of seasoned officers that could better answer for the true challenge (and how I overstate it). I am a submarine ELT(Engineering Lab. Tech.). I deal with plant chemistry and radcon (tons of paperwork). On a submarine there are three more nuke divisions (Machinery, Electrical and Reactor Controls), all with loads of paperwork, work to do, and the ability to go home once they finish.
As an officer, you will stand Engineering Duty Officer in port, and Engineering Officer of the Watch at sea. You are the Man in Charge of the engineering spaces, with more or less direct control over everything that happens therein. A lot of stuff happens 'therein,' and just about all of it requires your authorization (before), oversight (during; often directly carried out by a senior enlisted supervisor and reported to you), and review (after).
Remember that many enlisted folk are more interested in liberty (going home at the end of the day) than just about anything, and will try to steam-roll things through you to get the job done. That can and will (only once, if you're good) screw you. On a submarine, the military environment is not quite so formal, and the lines between paygrades will blur once you go on deployment together. That may cause people to take a buddy-buddy approach to their agendas when it comes time to get a job done, and you may be tempted to trust a guy just because he is like a 'friend' to you. That can/will bite you in the end. The tough thing here comes from the fact that you need to be a 'people person' to be effective in a submarine environment (malevolent dictator works as well, but no one gains from that).
Now that I have spouted a bunch of vague nonsense, I guess I can say that you will have to pay 100% attention to everything you put your signature on or give a nod of approval to. No matter how competent a guy seems, I'd recommend you make him prove to you what he wants to do. It may take some extra time, but you WILL catch mistakes before they happen if you take this approach. Know that every time anything screws up in your division (you will be placed in charge of a nuke division right out of school if you go to a submarine), you will have to talk to the Commanding Officer about it. Also know that a culture of complacency can creep up on even the best divisions, and that as a division officer you will have to keep that in check. Remember that the average age of a Navy nuclear operator is about 21 (someone correct me if I'm wrong), probably too young to be in charge of a reactor plant. That leaves you, fresh out of school, as the adult supervision. You will have a senior enlisted supervisor (probably about 25 years old), and he WILL have your back, but ultimate responsibility of the plant falls to you. That means that our Program's 50+ year perfect safety record sits in your hands every time you say "I relieve you."
I know that I have over stated it here, but that's how I see a nuke officer's job. One of the salty sea-dog officers can tell you what it's really like. No pressure or anything. Good luck.
Question: Did I just play the Judas role against us enlisted folk?