As another former NICU worker: I couldn't agree more. 30 weekers do really well. Every day beyond today they hang out is great. Follow your dr's advice. It's scary as there's only so much you can do about it. Prayers for you and your whole family!
I'm not sure how you process/handle things, but I like a lot of information/research ahead of time to help me cope. If you're the same way, and the NICU is unfamiliar territory, it might be worth learning about the various equipment, etc. used in there (isolettes vs. open beds, etc) and the various rules (can family visit-when would your boys be able to meet the babies, etc). Hopefully it'll all be info you won't end up needing!