That is a very inefficient method. You will be setting up two librarys which will duplicate a lot of tracks (and waste space)
I run 7 from the same Library. It is easy.
Add two folders
MY MUSIC
YOUR MUSIC
and drag your songs or playlist to your own folder.
When you connect your iPod, it appears under devices on the left. When you click on that, the window shows and box that says Manually manage music. Check that box. Then go to the music tab and click selected playlists and click on your folder.