I tend to go with what my coach thinks. For me, I am never going to feel 100% comfortable and confident, so I need her to tell me when they look good enough. For me, I like to self sabotage - I did that 3 of the 5 times I took my junior moves. The first time I wasn't entirely ready (it was a let's see where you are thing...they were close to standard), and the last time I passed. I talk my self out of it, get way nervous, and don't skate with the power I have...which at the Novice/Junior/now Senior level...is an issue... And on Junior...those darn power pulls were scary as all heck...
I always practice my moves in the order they are in the test and I get really messed up if I do them out of order. I do that so it becomes a habit.
There is a pattern to me and tests:
1) Coach and I decide on testing. Send in paperwork months in advance to make sure I get in (around here it is common to be closed out of sessions).
2) I go gung-ho practicing.
3) Total breakdown for about a week before the test...moves look like crud, I'm all over the place, can't stay on my feet, etc. I get tempted to pull the test...then I remember how much $$ tests are
Coach knows that this needs to happen because if it doesn't happen before the test...it will happen on test day (I had that happen during my Novice test...luckily I kept it together enough to pass on the first attempt).
4) Test day - I need to get to the rink with plenty of time otherwise I get nervous about missing my time. I generally take the day or at least a 1/2 day off work. Before warmup (timing is iffy on this - it depends on the skating order) I eat a pack of Twix bars (it MUST be Twix...nothing else works) so that the sugar rush will kick in when I start my test...my coach and just about everyone else thinks this is the weirdest thing ever, but hey, it works for me! Warmup is pretty much on my own. Coach will help if needed, but she usually lets me do my thing. During the test, I will stop to get water once and usually blow my nose.
5) Wish for the best! Since I test standard track (started testing as a kid), I sometimes don't know what the expectations from the judges will be since "power" is subjective. I have had coaches (and some parents) shocked that I didn't pass some of my tests because I do generate a ton of power.