We'll be waking up nice and early too, around 3am, to hopefully get to the airport around 4-4:30am, our flight leaves at 6. I am a nervous flyer, but I worry about getting through security and stuff too-my license only has my first initial on it and I always worry a bit that that will cause me problems at security.
I guess it is a given being sleepy on Day 1) ...the adrenaline of arriving keeps you going though 
good luck w/ your security check!
I couldn't change mine online either; was it telling you that there were "modifications to your reservation that prevent it from being changed online"? I thought it was because just my first initial is on my ticket, but then someone on facebook said the website was experiencing some trouble anyway. When I called I was told the estimated wait would be between 27-42 minutes. OK, I don't have anything else to do! So I put the phone on speaker and hung out for 32 minutes.

I spoke to an awesome guy named Tony, who was able to override for me, and now I have $120 in credits-that will come in handy for our grad school trip in January! And my Earlybird check in stayed put as well!