Like Treewind, I would recommend Scribus, and not just because it is FREE.
Desk Top Publishing software gives you 100% control of where something is positioned and the size of images, unlike word processors, which move stuff at random if you dare to add an extra word into a line of text.
With DTP you put boxes on a page,then fill them with text or images. You can control the dimensions and exact positioning, usually by typing in real measurements (Up 1.23cm and Left 2.45cm will put the box exactly at that place).
It takes time to set up a blank page, but once done, you can save it as a template for every similar project. If you asked nicely, someone here might already have a template set up for printing CD covers.
I have done advertising flyers and business cards using Scribus and it is not difficult to use. It just takes a different way of laying out a page. Imagine cutting out photos and gluing them on to a sheet of A4. This is the computer equivalent - Simple!