For me, I just try to make sure I eat enough and drink enough water and that's about it.
There are roles that are terrifying because they're large or you may feel that they're out of your line, but I'm never terrified once the actual work begins. Once you begin rehearsal, then it's small building blocks. It's solving little problems one at a time.
In Dreams... well, I was slightly overcompensating with that. I was a bit like a director for hire, so maybe I was putting too much imagery that was familiar to me into it.

