Aaaagh, I've gone and done it.
Of course I don't like it.
Steve's instructions worked perfectly.
Adam is right, obviously I need to shrink the photo considerably before uploading it. Baz had already cropped it long and thin - it'll be perfect once we get the size sorted out. Any hints Adam as to what size works just to fill the width of the page?
The thing that really bugs me about this layout is the way the end of one post is squished right up against the title of the next one. Any way around that that anyone knows of?
I will keep persevering; I don't want to give up just because I'm an old stick-in-the-mud and resistant to progress, but I hope we can overcome these little glitches. In the meantime, please consider it very much a work in progress.