SFC said it best – think of it as a series of 10 mile rides. Start riding now, even when it’s raining (not lightening of course), be aware of your surroundings, and find other people interested in riding too. You’ll do fine. Wanting to do it is 80% of the battle. This isn’t a race, and if you worry too much about the ride itself you’ll miss sooooo much of the fabulousness that is RAGBRAI. Where do you live?