Here is what I think is the most important bit, except the part about the checks:
5. Figure out what lies you need to tell yourself in order to produce your best work, then put lots of effort into believing them.
Do this. It works good.
My lies are as follows:
1) Don't worry, nobody's watching.
2) What you are doing is important to somebody so do it well.
Yes, these are mutually exclusive. No, that doesn't bother me. Because those are my lies and I believe them.
Here's Steve's whole interview.