Howzzat: Hi Stefan,
Can you recommend a good "proper CMS with a wysiwyg content editor" for a marginally skilled novice?

There are quite a few out there, WordPress is an obvious choice to look at but there are others such as WebsiteBaker, gpEasy, GetSimple, etc.

The only thing is that these require PHP and a database to function so if your current host don't provide it then you won't be able to use them.

If your current host doesn't provide those features then I would recommend switching to a better host as those features a standard nowadays.