Having a CMS to control your site's content, and a working knowledge of php/mysql is not a prerequisite to using a CMS. I know many people who use a CMS for their websites and don't know the first thing about how to write code for php/mysql. Granted it is very convenient to know the code and eventually learn it if you are interested, but do not let the code stop you from using a CMS for your website.

When I got into php/mysql I didn't know which pieces I would ever need to redo, but I did know related languages well enough to stumble my way through in the beginning. That was nearly 2 years ago and now I have several php/mysql sites up and running.

Nowadays, I dread when I need to go back and update my old static html site. It just isn't as fun to play with anymore, but I do work on it. Someday I will put it all into a php-driven site and the content will be much faster to update and maintain.