From OB to ED??

So here is my issue... I currently working on a postpartum/newborn nsy unit. I have worked on my current unit for over a year. I would like to go back to grad school for NPWH and CNM or NP for ER soon. I have been thinking about if I was to stay at my current job what would I gain that would help me in grad school, yes working with postpartum pts would help ect. However I have been thinking about the ED. I have been thinking about all the exp I would gain from the ED that would make me an over all better clinical nurse as well as a better NP. A few things are causing me some concern... I am afraid I wont know everything to make it in the ED and the pace, the orientation process is 6 months. Also I currently love what I do now in postpartum but can see my self loving the ED, its just so hard to leave a place you like for the unknown. Have any advice?