Advice from people who really know (including an agent)
Another really interesting newsletter. I think in the world of non-fiction an agent is less necessary. I know of lots of journalists who have published lots of successful non-fiction books without an agent. But you do need to know what you are doing and need to talk to lots of other authors about the pros and cons. I think it's very different if you don't come from a journalism background. I have never felt the need for an agent but if I moved across to fiction I might think differently.