First line...

I'm getting really anxious to start writing on the 1st, but I know exactly whats going to happen. I'll get up at 5am that morning... and have NOTHING to write! I can't bear to even write the first line cos it'll feel like cheating. Has anyone got any advice that I can use when this inevitably happens?

I already have a detailed plot/ theme/ character outline, and a few bullet points for the first section.