Well, for starters, it took me almost a full year of working in a Level III NICU before I could go to work without feeling like I was either going to vomit or have a panic attack! LOL So don't feel bad if you get nervous, and realize that you may start thinking, Oh, wow, I can't handle this! but you CAN. It really helped me to keep reminding myself that everyone, even our directors and managers and the doctors and ESPECIALLY the other nurses (who can be intimidating, sometimes) all had to start at the beginning, knowing virtually nothing.
As far as peds, I learned very little in my rotation that I used in the NICU, so have no fear about that!
Good luck, and if you have any specific questions please let us know!
Welcome to the forum!