I thought that like everyone body knew about this little handy trick but i was amazed that almost no body did this or knew how when i told them to. so i just deciding contributing this post would help the people that dont know how to do it.
Me and my guildies use this trick alot to get home = )
simply just get a friend/guildie/anyone to invite you to thire group walk into an instance and tell them to kick you. 60 seconds later your at your hearth stone spot = )
this is confirmed since i do it all the time = )