The examiner will normally move his seat back so he can watch you better so he won't be in your eyeline so try to forget that he is there.There is no need to be nervous,just do the best you can.Don't rush anything after all the more time you take the less driving you will have to do,however don't be hesitent ,taking your time and being hesitent are totally different things.You could try a few cups of Camomile Tea as well it's supposed to help calm you.Good Luck,let us know the result