Suppose when things don't turn out the way which you expected, recognize what you could have done differently and verbalize this realization to your employees. This shows them that you make mistakes too, and it also shows them how they should handle their own mistakes.

Whenever you're doing something correctly after having done it incorrectly in the past, let whoever is watching know. For example: "The reason I know to press this button is because this happened to me when I first started out, and I made the mistake of pressing the blue button, thinking 'This will shut down the system, which should resolve the issue' and I found out" the hard way "that it makes the issue even worse!"