I know how that goes, when i first started trialing, i would get so
nervous that i would forget how i had decided to handle something, and
would mess my poor dog up (luckily he was rather forgiving) but then i
would be messed up for the rest of the course and things would go
downhill from there.
I have gotten better about that, but i still finding myself walking the
course more times than the average person, and in several ways at high
speed to find out what works best when i am RUNNING the course, not
just walking it.