The power of keeping a journal -- also of recording video/audio of past self -- you can't judge how you've changed if you don't record absolutely who you were. It's surprising sometimes how frequently you second-guess your past self after a persistent and extended changeover many years. The few things that got recorded by random chance are some of the most precious to me. See below under "I listened to the tape"
Dream Journal

have been keeping a dream journal for several months now, adding to it whenever I can and going back to read it as often as possible at the end of each day. I feel like like 30 and control of my dreams has expanded that I have started analyzing them. This is a great example of something that seems impossible at 1st but then becomes progressively easier once you pick it up.(Reminds me of slack lining, indo-boarding, many types of balance activities)