I felt unprepared when I started, but I think everybody does. I avoided the general med-surg clinicals like the plague when I could... instead did cancer, GI, cardiology. Never inserted a Foley on a guy. Probably not the best idea... until I got into psych and school nursing, anyway. Now it's fine.
Any good hospital will give you an orientation that will fill in the gaps in your education. Everybody misses something and feels uncertain. For some people it's post-surgery stuff, for some it's Foleys, for some it's tele patients, for some it's dealing with the families of the dying. No program can cover everything without taking as long as medical school! Make sure you leave your orientation feeling ready- if not, ask for more...