i'm not a nurse, but as a CNA and a nursing student who is also SURROUNDED by other nursing students when i'm at work, i've learned a few things.
first, i had an instructor tell us before i had ever hit the floor, "you're going to see people doing things differently than what you've been taught. that doesn't mean they're "wrong". that was true for me and i kept my mouth shut and learned a few things by doing so.
i was getting vitals on a patient (keep in mind, this is real life) and i was getting them on an ill patient who had been sleeping so it was dark, i was trying to be quick, efficient and effective, etc. so i put the pulse ox on, then the blood pressure cuff (on the same arm as the pulse ox) and took the temperature. i made a mental note of the 02 sat and the pulse and THEN hit the button which starts taking the blood pressure. the nursing student who was watching immediately said, "you're supposed to do that on the other side." okay, annoying. technically, yes - it would be best (and textbook) to put the pulse ox on the opposite side of where i was taking the blood pressure, BUT since i was getting the pulse and 02 reading BEFORE starting the blood pressure, it doesn't affect the reading and therefore doesn't matter! not to mention, textbooks don't mention how you'll be entering dark rooms where bedside tables and IV poles will be in the way and the cords only give so much slack. they don't mention that you'll be doing this on patients who have a sleeping relative on the opposite side of the bed and it's not realistic to turn on the lights, wake them up, and move furniture so you can check the pulse on one hand and the BP on the other. furthermore, don't be so cocky to think that just because you're LEARNING to be a nurse that you can TELL a CNA who has done actual hands on work for much longer than you how to do things.
lastly, i get interrupted 1500 times a day to answer questions like, "where are the water pitchers?" so when i ask you to come and help ME do something don't hesitate. don't say, "uhh, umm. err." DO IT - if you're smart. it'll make your life easier.