I know that when the committee/supervisor process has worked correctly (and mine has), the defense itself is more of a formality than an actual test of the strength of the research. But that doesn't keep me from being nervous about it and making sure that I am super prepared.
I'm extra nervous because the tradition here is to bring refreshments to your defense to enjoy afterward with your committee and anyone else who has attended. This reminds me of living in student housing at the BY and having to do three things in a matter of days: study for/take final exams, clean your apartment for inspections, and pack up/move out. Impossible.
So I'm working on my presentation when I can. Then, when I'm rocking my baby and can't type, I'm running through the menu and food preparation schedule in my head. No big deal.
Except it IS a big deal. The biggest deal! Wish me luck.