On first look it's simple enough: save a .doc file as a .htm, run it through the mobi-pocket creator and create a .prc file ready to upload via the Kindle load pages. Simple.
However, there are, I've come to learn, some finer points which need tweaking to make the finished product look as good as it could. With two uploads already I think I've pretty much got it sorted, but it's not as straight forward as it first appears.
Hopefully all future Kindle uploads will be smoother and more professional-looking.