Some ideas I consider important.

Compassion and Curiosity
Don't judge. Listen. Don't assume you know. Ask.
It's okay to make mistakes
It is literally impossible to learn anything without making a mistake and correcting it. So go ahead and make mistakes!
User requests are what computers are for
The computer user is the most important half of the user and computer relationship. Don't waste their time. Don't get in their way. Try to help them be awesome.