Hi!
I know exactly what your going through, I was very nervous on the day of my skills test, but afterwards, and even half way through it I thought to myself 'Why did I get so worried!'.
I think the best advice anyone could give is to fly it like you've been taught, safety being paramount in everything you do but most of all, ENJOY IT! That's what the examiner said to me before we went flying anyway
I had a little mock test before the real thing, where I got the oppurtunity to go through everything on the practical flying syllabus just to make sure I was confident, and that helped a lot.
Very best of luck to you, and when you pass, I think you'll already know what's best...straight down to the local
You'll also be high on adrenalin post skills test for about a month!