This should be the easiest part right?
It seems daunting to go back and look at all the things you could-a, would-a, should-a done. Start with one page. It doesn’t even have to be in order, because you can move the pages around later.
Once you finish one page, go to the next one. Do it in manageable sections. Chances are, you’re not going to finish it all in one day. There is no deadline other than the one you choose to set for yourself.
If you find yourself getting overwhelmed, stop whatever you’re working on, and work on a different page/story/topic that’s easier. Maybe it’s too much to talk about the birth story, but you can write about the outfit your baby wore on his/her way home from the hospital.
This is supposed to be a fun project. If you find that it’s stressing you out, take a break, and come back to it again later.