do what i did and pop a tyre driving up a curb 40 mins before the exam and have a mad dash to a garage to get new tyres and drive to the test centre with the instructor at 90mph...
nah, just think its not difficult its like riding a bike, just practice and if youre practiced enough it will just be like having a lesson. dont be afraid to tell your examiner to be quiet too - mine started yapping about her holiday as i was approaching a major intersection and i had to tell her to button it! i passed first time, 6 minors and i think those were because midway through i got bored and started thinking about a guitar riff i was writing before id left