Re: A bit OT, but...
"Converting" the iTunes library?
Assuming they don't have a pile of DRM encumbered books, audio books, and movies they can just copy their music files to their phone. Just plug it in and Drag & Drop.
The fact that Apple likes to scramble things can make is more complicated though.
Content with Apple DRM only plays on Apple devices. If you have been an Apple-only media glutton then you're kind of out of luck. Apple has helped turn something like a VHS tape into something that would keep you trapped with a single hardware vendor.