Neeps,
It sounds like you have got your head screwed on. Don't get it bogged down in the minutiae. The interviewers will be aware that you have read up on your chosen trade (if you can remember it all at interview!).
You will also have to do the RAF Fitness Test (shuttle runs, press ups and sit ups) and this is effectively pass/fail (if not actually pass/fail) so, make sure that you are not just sitting about lloking at a map of the world with pins in it. Get running!
Good Luck.
kipper
(if selected, you will be on a 30 week IOT)