A new security release of Joomla 1.5 was published in May 2010: Joomla 1.5.18. An update is highly recommanded.
-> Joomla-Update Recommanded
Basic knowledge of script languages like HTML or CSS is always useful - for small webpages as well as for content management systems like Joomla: It helps if you understand a bit of the source code.
A content management system like Joomla is constructed for the use without HTML knowledge. In the beginning it needs schooling, though. Starting from login up to writing new articles and user administration we show you, how it works - using examples of your daily experience.
Smaller changes on your simply constructed domain you easily can accomplish by yourself: You need some basic knowledge of HTML and CSS and how to transfer the files to the web. How this works, we show you in a training at your personal computer and focussed on changes of your own web space. If necessary, there are open source applications for file transfer, web editoring and image editing, which I can show you. Basic HTML knowledge is helpfu, if you are working with content management systems as well.
Schedule, number of participants, location, special wishes as agreed.