Tamara Sheehan, author of The Tenth Man and The Mediocre Assassin’s Handbook, gives three tips for aspiring pros that manage to be both sobering and entertaining:
Writing is work that can make you go crazy. It’s Sisyphean. It’s long hours for little acknowledgment. For the majority of us, it does not and will not ever pay as much as our day jobs. Want to go have a little cry? Go ahead. I understand. I did too, when I got it.
Update 10/05/2009: I revised this post based on the information discussed here