The videos will show you how to setup projects and use a post build event to copy up your user control and dll to the main web, as well as how to use the installation system. However some things in the video are out of date like the standard markup you should use in your UserControl to make it style like other features has changed since those videos were made. The Hello World example code has been updated to show the newer markup, or you can review the code for other included features in mojoPortal. You could manually install it as described in the hello world article or you could use the installation system which is the preferred way to do it.
Hope that helps,
Joe