I don't that you are 'over thinking' it at all. As a matter of fact, I think that it shows that you are truly preparing for this challenge.
I am in Block one, and I am amazed at how much time this process takes. We are in class about 24 hours per week. This will increase when we start picking pts for care plans
(prob another 3-4 hours per week). Don't forget the commute (another 2-4 hrs per week), and study time (can be anywhere from 2-6 hours per week. Add this to work, and laundry, sleep, etc. and you definitely have a FULL TIME commitment on your hands. Although a select few can continue to do everything in nursing school that they did before, most won't. If I have any advice, it would be to get into a position in which you can work part-time, surround yourself with people who will support you financially and emotionally (whatever your situation dictates), and realize that succeeding in this journey is about more than being book smart.
I have noticed that the amount of energy spent seems to correlate to your clinical exposure. The students in our class that have no medical experience need to review much more that those that have worked as tech, phlebs, etc. If I were going into this process with no health care experience, I would tag on some more time to learn, review, and adjust to the process. I would also recommend taking medical terminology
(as much as you can get), and even signing up for patho-physiology (even though it isn't required). I would get my hands on a basic pharmacology book and become acquainted with some of the different drug classifications.
This may seem like a little too much, but it's my 2 cents. Good luck in your journey.