Alot of it depends on the examiner you have.
I took my test in sale (near manchester), and was very lucky on my test to pass first time. Made a few mistakes which i thought had failed me - i stalled before even moving off for example, but didnt even get a minor for that; and then on my reverse park I hit the curb before correcting it, and only got a minor for that (sure it should have been a major..)
Thing to remember is to try try try again, whether you pass first time or not doesnt matter, it doesnt make you a better or worse driver - in fact as others have said it can help you as you will probably have more lessons, and get more practice.
It's worth keeping on at it, passing is one of the best feelings in the world (although i don't think Vini was right in saying its better than sex ) and I love driving, 3 years and counting with no accidents driving > walking/cylcing/any otehr form of transport except maybe a space shuttle but i havnt tried that..yet