Thanks, it worked this time. I have gone thru it a few times, but haven't tried it with my own Paint.net open. I can see one thing that confuses me already, lol. Right at the beginning, it says to import an image -fine - then under Layers - import from file - fine. Then it says to keep importing as many as you want, but the image on the tutorial shows one pic immediately pasting onto the other one and that is where I get confused. When I did this in Paint.net, the second pic I imported just replaced the first one on my screen - I never got one big one in the background and a smaller one on top of that one.
Oh well, I'll try it with my own application open and follow the steps to the letter to see if it works. Maybe I am just destined not to get this ;-)