There are a few books written by people who've lived for extended periods in small sailboats, some of whom are relatively famous. The books have a lot of practical tips and gotchas that I thought were really informative. You can't learn to sail by reading, but you can learn a lot about living on a sailboat that way.

I particularly thought "Time on Ice: A Winter Voyage to Antarctica" by Deborah Shapiro and Rolf Bjelke (two world class sailors who've set many records) was absolutely superb. They purposefully wintered over in Antarctica stuck in the ice, in a miniature replica of Shackleton's trip. Talk about being self-sufficient.