lack of experience

I am an RN with 2 yrs experience in SDS specializing in optholmology. I am now wanting to get more experience in other areas such as NICU, L&D, GYN, SDS or PACU. (Keep in mind I am willing to work in any field however these units are very competative and would be more of my desire.) Most of these units want an x amount of years experience before they will hire you let alone consider you for these positions. My question is how do I get this experience if no one is willing to give me a try. Do, I need to shadow the nurses on the units, talk to the managers them selfs, ect. Any advice would be greatly appreciated.