Don't look at the whole picture. Just look at the tiny jobs needed to do one small area. For the address book, just do the "A"s this week, then the "B"s......
Bathrooms, clean the sink today and the counter tomorrow. Clean the shower one wall each time you take a shower, you don't have to clean the whole shower all at once. Really, there is no law, you won't be arrested for cleaning just part of something. Give it a try.
Just pick one area or one small thing to do. So something each day no matter how small it is. Don't think of how much is left to do. Look at the one small thing you did and be proud.
You can do get it done in baby steps. It didn't get to be a mess overnight and it won't be cleaned overnight. Give it time but make one small step forward every day.