Please keep in mind that I'm electronically challenged. Having said this, will I come across much difficulty in swapping out my avic d2 for an avic Z2 myself? Is it simply unplugging and plugging in wires with the same set up? The avic d2 was originally professionally installed into my 05 corvette.

No, it uses a different harness so it will require a little bit of cutting wires and reconnecting others. Pretty easy to do though