First on-call rotation starts in three weeks and I'm quietly dreading it

Not the technical part, weirdly. It's the phone going off at 3am and me being the person who's meant to know what to do.

I've shadowed two rotations and both were completely dead, which somehow made it worse. I've still never watched anyone handle a real page.

For those who've done it: what actually helped the first time round? Stuff I should be reading now, or is it mostly just surviving one bad night and finding out you don't die?