'[GSV
Trig;2147681']Not being funny but 4.x to 5.x is a major upgrade, back up your phone, wipe the phone, then install iOS5 and then set it back up…
That seems to be the easiest way to do it.. It takes a lot longer but I didn't encounter a single error.
Only took a little over 2 hours to get it all done, music and apps transferred over and everything set up properly.
I hope my 4S arrives early on tomorrow to get it all set up early on :D