Here's an article I wish I'd read before I started library school. "How to Become a 21st Century Librarian" by Meredith Schwartz was published in Library Journal in March of 2013. Recommended reading for anyone thinking about a career in librarianship.
Not that I wouldn't make the same career choice, but some of Schwartz's advise about schools, courses, financing, and career planning might have made the path a little less bumpy. She includes plenty of practical advice and links to sources for more information for the student, novice, and even the experienced librarian.