I think the best way to break it to people in your family, is to tell them 1 by one, and have them know that you don't want them to talk about it with anyone.
if they are curious, have them read the china FAQ. and tell them that it is as safe as a boob job.
but as for telling friends.......... that's a tough 1.
I believe it is important for family to know if your travelling to another country as it would be very demoralizing running to another country hiding it and pretending like nothing happened, most people who do this end up being to scared to come back until they are 100% healed(due to the worry about family noticing that they cant walk properly). I personally think this is to much emotional stress to go through. and that is why I believe family should know. but the question is can your family be trusted to keep it a secret. if they cant then it might be best not to tell them at all.
what does everyone else think about telling friends? should you even tell friends? could you handle the outcome if your friends told other people? friends are here today gone tomorrow. when people stop being your friend you can bet they will tell others.
I have told 1 friend and I don't plan on telling anyone else. apart from that family know. and even then not all family.