There is nothing that can prepare you for the first time you live abroad. It will probably be the most daunting, exciting and brave decision you will ever make, even if you are well travelled.
As a traveller you will step off the plane with a clear idea of the things you want to see and do, before hopping onto the next plane, ferry or train and travelling onto your next destination. Whereas if you are planning to live there, stepping off the plane can feel a lot more uncertain.
Having both lived and travelled abroad, I know first-hand how different they can be.