I was a new grad in the PICU, and it is definitely my first love. First you have to know that it is unlike anything you ever did in nursing school
, so be prepared for a steep learning curve...there was many days I went home in tears overwhelmed in the first few months. It will take about a year to feel comfortable on your own. Definitely review your math on weight based med/gtt calculations until you can do it in your head. Ask lots of questions, don't do it unless you can. Also "Fake it til you make it". Parents can't stand a nurse who seem unsure of themselves, so exude confidence even if you don't feel it. Also really think about how you are going to feel the first time you see a child die, and have to comfort the family. That was something I never really sat down and thought through, and it really got me. I cried everyday day for a week on my way to work, and to this day I can still remeber that baby's name and face. So don't be afraid to talk about it, seek out a religious figure, or EAP at work if you need to. It will never get easy, but easier to cope.
I could go on and on, but you will be fine. It is an amazing specialty and no doubt you will love it.