Have confidence in yourself! I lacked self-confidence as a student and a new nurse and that lack of confidence held me back personally and professionally.
It took me many years go grow some backbone and learn to stand up for myself. Now I choose my battles and sometimes I let things go, but I'm no longer a pushover. I would have been much happier in my career and in life had I figured this out earlier.
As a student, I wish I had paid more attention to the unit routines. I think I would have been more confident if I knew what I was supposed to be doing at any given time. Also, I was kind of scared of "difficult" patients as a student (vents, especially). I wish I could tell myself to get over it, because it's not that big of a deal for me now.
Take any and every opportunity that presents itself (and seek new ones) to perform skills that you have "learned." If you practice as a student, you have one less worry when you start your first nursing job. Bite the bullet and DO IT!
Skip that one job "opportunity" to work in Staff Education. Your boss will turn out to be an evil, sadistic slave driver and you will have nightmares for the next 25 years if you take it. Ditto that first School nurse job--Walk on by, girl. The next one will be so much better you won't believe it.