How Do You Know When You Know Enough?
What is substantive editing?
Fact-checking a new word, part 1 and part 2 from Copyediting.com (link found through EditFish's reading list 5-Sept-12)
10 Marks of a Self-Disciplined Freelancer
Also be sure to read the comments, as Angela Booth says:
If you decide you want to work with a company, don’t quit if they ignore your first dozen pitches. Keep pitching. Decide that you won’t stop pitching that company until one of three things happens: they go out of business, you die, or they offer you a contract.
Not only the best attitude, but she wins my vote for the best way to put this!
Adventures in full-time self-employment (Libro) has written Going It Alone at 40 in case you feel a need for encouragement.