Here's what most people do: They look through the trades or online and "cold" submit. The problem with that is, the people who get the cold submissions are being bombarded, because if you found it, so did many others.
You've heard me say it over and over!!!! Contacts CONTACTS CONTACTS!!! You are going to get jobs through the people you know. An agent isn't the answer to getting you work. They get +10% because YOU are 100% responsible for your career. Research what jobs are out there and then do your 6 degrees of Kevin Bacon to figure out who you know who knows somone who is connected to that production.
Network, research, preparation, follow through, professionalism. All ways to get work without an agent.
For more tips and articles by top entertainment industry career coach, The Greenlight Coach, visit http://www.TheGreenlightCoach.com