The cat won't go as hand baggage on the plane with you, she'll go in the cargo hold in the animal section near the luggage.

You will check her in with your luggage at the check-in desk and then she will be brought out to you the other end by the luggage carousel.

An animal that travels as cargo is completely different, goes to a different section of the airport, has to clear customs and takes a lot longer - that's when you should definately use a pet relocator.

This is why people pay for a pet relocator to do the permit as they offer all this assistance and advice and will help you with every step.