Looks like I pulled it off. In spite of a severe head-wound suffered earlier today whilst researching the installation (voluntarily slammed repeatedly and violently into my desk) I figgered it out. If I'm honest (ha!) it was easy, but I'm known for being ridiculously cautious to the point of just standing there stunned and barely breathing. But I done did it thanks to an excellent and intuitive installer.
Having used various Linux distros over the past 15 years, I think (ha!) I'm qualified to say this is the most exciting OS I have yet tried. It is deep and robust, elegant and sophisticated, things I might venture were and still are absent with several others I have abused. It's skilled, adaptable and effective which is very high praise from me. I am most grateful to the developers and their fellow travelers.