Howell, if you're still checking this thread, I'd like to say I did the CSS upgrade and managed to change a lot of items on my blog like color and font (although width wasn't one of them) without knowing one thing about programming. What I did was find a site that gave some of the basic vocabulary, then load up the code on the page where you can edit it, and change one item at a time, each time using the preview feature to see what happened. It took a while but I did manage to make it work the way I wanted it to. People say 'don't depend on the forum' but when I got stuck, I came to the forum and each time they helped me, as long as I made the effort to communicate carefully what I was trying to do and showed good faith in looking for an answer first in existing threads. Your responses to the jargon used in this thread (they can't help it, they forget how it sounds to people who haven't got a single clue what even 'theme' means!) was persistent and I don't doubt you could do it.
By the way, I went and looked at your blog and I actually like it the width it is now. It's already very dense with information and if it were wider it could be overpowering. Just sayin.' It looks like a very nice blog.
I wonder what they mean when they put things like @Howard. Back at 'cha?