All my life, I've moved. The first time, that I can really recall from memory, was hard. I cried, tried to make the best of the time I had left with my friends, and so forth. I say, although your moving, keep in contact with the friends you have now, either through letters, calling, or IMing. Maybe even a combination of those.

But in time, just expect that there's a chance you could lose touch..moving on with life. Don't worry, you'll make new friends, and come to appreciate the new place you could possibly be moving to.
And it is true, IMO, that if you keep an positive attitude about things, it'll seem a little easier. Even if it's not by all that much.