The three best pieces of advice I can give? Put in the miles, put in the miles, put in the miles. And work on that mental toughness -- that's what will get you through the inevitable stretch when you feel like whale puke on the bottom of the ocean, and then all of a sudden you're feeling so good you swear you could eradicate world hunger, illiteracy, and AIDS single-handedly. Oh, and make sure you stay hydrated and take on enough fuel. And try to make your first attempt at that distance in the company of others -- with a friend or on an organized ride -- that way there's plenty of activity, conversation, etc., to occupy your time and help the miles fly by. (Well now, I think that was actually six pieces of advice.

)
Set a goal and work toward it! We are women of the 21st century, and there's nothing we can't accomplish!!