The new iPhone is here and, as always, users are reporting some launch day hiccups. The biggest one I've seen people talking about is a nasty one. You backup your current phone, plug in the new iPhone 6, hit restore from backup and... it hangs after the first app or 2 leaving you hopelessly stuck at "Copying 1/102 Apps".
Most of the people reporting this issue are using their lightning cables plugged right into their machines to do the syncing. Some people have tried simply cancelling the sync by clicking the X under devices in iTunes. Unfortunately, this will pop up a window under iTunes that says something to the effect of "Completing Sync" and there it hangs endlessly, forcing you to force quit out of iTunes and try again. But even after trying again, it will still get stuck after 2 or 3 apps. If you have many apps you need to restore, unplugging, force quitting and retrying will take you hours and a lot of patience. Here are the 2 methods people have reported that seem to work.