Up until now, my novels have all been written in third person. I came up with an idea for another one yesterday though, that I'm imagining in first person. The story idea just strikes me as being more powerful if it's cast as the main character telling his own story. Having written only third person previously, I'm a little nervous about undertaking a first person story. Have you written in both formats? If you have, did you have any trouble making the shift? Are there any pitfalls that I should look out for?