1. Don't let the perfect be the enemy of the good (as seen on Gretchen Rubin's Happiness Blog)
The bottom 2 shelves of the bookcases now contain folders from my school days and 2 university degrees. I wanted to thoroughly sort through all the folders and decide what to keep. Instead I just put them as neatly as I could in the shelves, with a promise to myself to sort them later. Not perfect, but good is enough at midnight. And good is better than not having done this at all!
2. Don't save things for best.
I was trying to decide which book to start to read in the bath and thought of a new book that I have bought myself for Christmas ("And another Thing" by Eoin Colfer, the last in the Hitchhiker's Guide to the Galaxy series). I immediately thought "No, I should save that for a special occasion". And then it dawned on me, every day is a special occasion. Don't buy or keep things for best, just use and enjoy them in the moment.
And with no further ado, let bathtime and relaxation commence!