Show up. Every day. No matter what. That's a lot of it.
Other minor stuff is doing what you say you'll do, and admitting when you don't know something.
I never had to fire anyone that showed up on time, did what they said they'd do, or admitted when they don't know something.
Fired plenty that didn't understand the 40 hour concept.
/johnny
My boss calls in sick alot. I tell her half the battle is won just showing up.