Here's how to watch the class on how to access Voyager data through the Planetary Data System, which I conducted to a small audience this morning.
Go to the Space Imaging section of our website, to the Tutorials page, and follow the links to the WebEx recording, either streamed or downloaded. You should download and install NASAView before running through the class. In the class, I assume that you have watched classes I and II so understand how and why to manipulate a histogram and what an RGB color composite is. I use GIMP for demonstrations of image processing.