1 - Make sure you explain things that are appropriate to the lesson only. You can allude to more complex ideas in order to give the student a place to go next, but keep yourself focused. Nobody wants to listen to 10 minutes of loosely linked rambling when all they googled was how to play a tapping lick.
2 - Don't overplay your examples. If possible, keep them long enough to show the point, but short enough that its not just you showing off.
3 - At the same time, make sure the examples are cleanly played. If you're learning from someone, you expect them to have mastered the things they're teaching you. A sloppily played example is often worse than no example at all since it makes it difficult to discern whats being shown.
Alternatively, check this out:
http://www.youtube.com/watch?v=NwZLFg7npuI