New grads start in the ICU so you can too...you will be like Novice to Expert all over again, but with some experience...I was in long-term care and went to surgical unit as PRN job, then after 4 years I went full time to the ICU. I was a Novice after becoming Expert in my field and comfort zone but after 5 years I am in the ICU cross trained in medical, cardiac, neuro, surgical and cardiac surgery ICU, even did a little nurse travel in the ICU with my background...summing it up, go for the change and love the adrenaline the ICU has to offer