How do I sync iTunes music to two different iPhones on two different user accounts?

Question

I have read some posts and a help article about this, but I need some clarification becuause what I'm doing is not working out correctly.  My wife syncs her iPhone and iPod to her iTunes.  I recently purchased an iPhone and am going to sync it to my own iTunes on a different user account on the computer.  How can I get the music from her iTunes account to sync with my iTunes/iPhone?  Whenever I try various routes, I end up with duplicated songs on my end and I'm not sure how it works when she adds music to her account.  My wife does all the music purchasing for the both of us and I want the music to sync both ways, but all other content needs to stay separate.  We are running iTunes 11 on Windows 7.  Any help would be appriciate and I'm sorry if this is a redundent question.  Thanks.

Answer 1

I followed the following articles: http://support.apple.com/kb/HT1495 and http://support.apple.com/kb/HT1203
Here are the questions I have regarding the second article which is not clear to me:
When dragging the media file to a public location, the article says not to move the iTunes folder.  Is it Ok that the media file is moved out of the iTunes folder when dragging it to the public location?  Is this what I am trying to accomplish?
There is a note about how iTunes for Windows does not, by default, copy items added to the library to the media folder.  Am I supposed to check the box to allow this?  Do I do the same for all users?
When I change the music folder location, am I changing it to the new public location?  Do I do this for all users on the computer that wants to use the same music files?
I tried changing the file location to the public folder, but received a message asking something to the effect of renaming files to keep the library organized.  Do I want this or not?
There is another note at the end that says if all users are storing their music in the same public location, then duplicates may appear in the library.  Isn't what this procedure is basically doing?  Can someone clarify this?
After following this article to the best of my ability, my iTunes ended up with duplicates of everything, even starting off with nothing there to begin with.