I'm always nervous, every time. One of my problems is that it's hard for me to articulate exactly how to do something in SQL, or explain it to other people...but if you put me in front of SQL Server with requirements, I'm totally fine. If you give me a query that's performing badly and tell me to make it run fast, I can almost always do that without too much difficulty.

But yeah...nervous? Every time, all the time. I feel like I never know enough.