I'm curious about this because I am working on a novel. My sales to date have all been short stories, and I edit those myself before submitting them. I have been on the editorial board of an academic journal (quite different from fiction, of course), and I am also an editor for a small fiction market, so I feel like I have a pretty good handle on editing the novel myself and putting it in good shape before submitting. I am curious, however, as to what the standard practice is, and what other novel writers recommend.