I'm riding in my first century on Saturday along Maryland's Eastern Shore. The weather is predicted to be in the low 70s with a 60 percent chance of rain. Ugh. I've never ridden in the rain (fine time to do it for the first time). Do I need to bring some kind of rain jacket? And what do I do with it (assuming I even had one) when it's not raining and I don't want to wear it? My seat bag isn't big enough to hold one more thing, and clearly tying it around my waist won't work very well on a bike.

You know, I'm fairly confident I can make it the 100 miles. It's just all the little things that are starting to worry me now. What to wear, will I have enough time, how crowded with the SAG stops be and will it be hard to get in and out of them in a timely manner, what if I get lost, etc., etc., etc. OK, I'll stop obsessing now.