How do I transfer my data and contacts from Nokia Lumia 920 to Blackberry Z3?

I prefer using my Windows 7 PC and/or Laptop, but any other means is welcomed.

If you can hook both phones to WiFi, you can use device switch. It's an app you can find for both phones on blackberry world and Google app store.

or you can sync it with one of your email accounts and then add that email acct to the new phone