Susan, maillotpois did a 600 a few years ago and has a wonderful race report on it. It may even be on TE, but for sure she'll respond to a PM about it. I know that because before my husband's first 600 last summer, I asked if she had any tips, and she did---they're right in the race report.
"My predominant feeling is one of gratitude. I have loved and been loved;I have been given much and I have given something in return...Above all, I have been a sentient being, a thinking animal, on this beautiful planet, and that in itself has been an enormous privilege and an adventure." O. Sacks