I think my real depressions started when I was about 16 and doing The Patty Duke Show. I would go to bed at about 10 o'clock on a Friday night and not get up again until 6:30 Monday morning.
Pick the day. Enjoy it - to the hilt. The day as it comes. People as they come... The past I think has helped me appreciate the present - and I don't want to spoil any of it by fretting about the future.