Never pass up an opportunity to use the loo, eat or catch a nap. You don't know when you will be able to do all or any of the above again.
At 200 hours I
thought I knew everything. At 1000 hours I was
sure I knew everything. At 5000 hours I realized I
was only just beginnig to learn.
And as a corollary to that:
The day you think you know everything about flying is the day you should turn in your wings.
Cheers,
Alt3.