This turns out to be a fairly straightforward process, except for one detail. My original plan had been to make the ebook free; after all, I wasn’t the only author. I’d seen plenty of free Kindle titles around, so that seemed straightforward. But it wasn’t until I had actually uploaded the formatted text that I discovered Amazon won’t let you initially set the price of your book as free. The minimum is US$0.99. If your title ends up free on rival stores, then it may end up being free on Amazon as a result of price matching, but you can’t make that decision easily yourself.
I wasn’t keen to set up a bunch more accounts with other publishing platforms just to achieve that, so in the end I went with the minimum price. In the (highly unlikely) event that anyone does actually buy a copy, I will donate all the proceeds to Medecins Sans Frontieres. If you’re tempted, here’s the link on Amazon. And special thanks to my brother Alex Kidman for proofing and editing.