Hi there
Yeh, this is an interesting issue I've also been grappling with. I'm writing up and wanting to include large chunks of articles that I've published and am also working out how to do this. I think you do need to rewrite the material - which you'll probably find you need to do anyway, so that it's a bit longer/shorter, emphasises other points etc etc. I've found most work doesn't neatly slot in verbatim anyway. When I've done this, I've added a footnote saying "This section adapted from Sue2604, 2009). If I am directly quoting myself, I do reference it properly. I've discussed it with my sup, and she wasn't able to give me a lot of guidance - surprisingly, since academics do this all the time. But this is how I'm approaching it.