Thank You Christine.
I have just researched child themes and they seem very useful. My CSS is very rusty. Last summer I learned the basics, but have not really used it since than.
With Child themes, and adding styles, is it simply changing the colour/shape/size of the parts of the site? Or can you actually change the layout as well?
It seems as though the better you get with WordPress, the less it becomes a template for websites, and the more it simply becomes a CMS system for a website you design yourself.