Sometimes, moves take us hundred's of miles from our home town – to new states, countries or continents. These moves are harder to plan for, and require much more stringent assessment of belongings, so that you can afford the move itself.
Long distance moves are harder on families who are used to supporting one another – you'll often find that your phone bill increases and that you'll have more problems adjusting if you're moving away from familial support – if you're moving TO your family though, you can be sure that things may get easier – if a little nutty. Moving back to one, or both families guarantees that your life will probably be filled with help – or interference, depending on how you view your family's input – either way, its worth it, once you find clear and consistent boundaries.
The move itself should be planned the same way as you would any other move – but remember, the more you're moving, the more petrol you'll need. A 400 mile move MAY end up costing you the same as renting a van in the UK – a move out of the country may be cost prohibitive, and it may be easier just to sell everything and start fresh when you get there.
A long move such as over several hundred miles may also change schooling arrangements, or your job – uprooting over a distance of hundreds of miles can lead to new opportunities – or the loss better ones back where you were – so you have to carefully evaluate what you want from your life, and whether it would be best served by moving to a whole new part of the world.
Moving to a different country or continent may leave you with language to consider – do you speak the language that is predominant there – and if not, can you learn it? If you can't communicate, you'll find it harder to do many things we take for granted.