Here are the more detailed videos produced by Swix Canada. It will take about 40 minutes or so to watch all of these.
Most of the information here is the same if you have watched the other videos, but there are some things you might pick up from these videos.
If you are still confused after watching all the videos on the site, go to your local ski shop and they can help you and sell you the tools you'll need.
Your coach should be able to clue you in on tuning and waxing; at least after watching these you should know the lingo!