I sold electric light bulbs to janitors, candy to drug stores, and Stoddard's Lectures from door to door. I had decided I was a total failure, when I saw an advertisement which indicated that somebody wanted an expert accountant. Not knowing anything about its I applied for the job and got it.
I am convinced that what are commonly known as "the breaks," good or bad, have fully as much to do with one's success or failure as ability. The break I got in this instance lay in the fact that my employer knew even less about the duties of an expert accountant than I did.

How I Wrote the Tarzan Books (1929)