Hello. I am a new graduate in CCU and although I cannot offer you expertise of a nurse who has been in the ICU for a long time, I can tell you my experiences thus far.
From what I have been told and what I have observed, there are some who make it and some that don't. This applies to both seasoned RN;s and newbies like you and me.
Confidence, the ability to ask questions, admit when you need help, willingness to go home and yes study.... just like you do after clinicals while in school is what it seems to make a person.
When you are looking for a position, be sure to question the orientation process. Mine included didactic one on one sessions as well as larger classroom settings in addition to clinical. Be sure that they have a solid preceptorship program...some units are so young that they will have preceptors who aren't experienced enough to explain the y's and how's.
I admit that it is a difficult way to go, but if you want ICU go for ICU!! If you are willing to make small sacrifices in the beginning, doing what you really enjoy will be worth it. In addition, many ICU nurses in my unit have said that although floor nursing may increase your confidence, some of the skills, etc, it is a world of difference. It doesn't make it any easier (according to them) to transition into the ICU setting.
I wish you the best of luck!!!!
-New CCU RN