One night while trying to become less of a Twitter twit I stumbled across a video of Mark Duplass’s keynote speech at SXSW. I thought it was fabulous, and ended up watching the entire speech even though I’m not interested in becoming a filmmaker. The speech was about how the cavalry is not coming. He encouraged filmmakers to start making films with whatever they had. No excuses, just get to work. I thought this was also a great lesson for writers. You Are Your Own Cavalry It dawned on me that this idea of a cavalry had been a recurring theme in my life. It began in my late teens…