The best idea I've heard was to post letters to the friends and family you really care about before you leave or are announced. Don't go in to detail on why you are leaving, simply say you have concerns and if they want to know, they can contact you. I am a strong believer in giving information only when it's wanted.
Amen to that, we followed the bouncing ball ourselves and would never expect anyone to follow us. JW's are so used to being spoon fed every bit of information that it would defeat the whole purpose of setting someone free if we provided more that a starting point to them. This point is a must in any letter to anyone.
Thanks,
J