I’ve never had anything resembling a secretary or a research assistant. I don’t want those. Each time I type, it gives me another shot at it, another look at it. As for research, I can’t begin to tell you the things I discovered while I was looking for something else. A research assistant couldn’t have done that. Not being a trained historian, I had botherations that led to good things. For instance, I didn’t take careful notes while reading. Then I’d get to something and I’d say, By golly, there’s something John Rawlins said at that time that’s real important. Where did I see it? Then I would remember that it was in a book with a red cover, close to the middle of the book, on the right-hand side and one third from the top of the page. So I’d spend an hour combing through all my red-bound books. I’d find it eventually, but I’d also find a great many other things in the course of the search.
You can read the whole 1997 interview here, including some helpful thoughts on the writing of narrative history and why he wishes historians were better writers.