You can't just copy from "View Source" and "change the background", etc., any more without also tunneling through to the CSS file and copying that, so there's a fair amount that you need to understand to do it.

It ain't simple any more, if you want your site to look decent (that is, to compete with others) and to do secure sales. To do it yourself will take a substantial investment of learning/tinkering time, especially given that it sounds like you're starting from scratch on the techie front.

There are various options nowadays that are less than doing it yourself and more than hiring someone, about which I know little:

Google Sites
-- here's an example: AZ We Dance

Intuit has recently started a business web site service. Don't know if it's available in the U.K.

There are probably other comparable things out there, too.

There are also lots of starving web designers out there... contact your local college that might provide training and see if you can get a recommendation from a prof...?

~ Becky in Long Beach