2003 G35 Sedan AVIC-D3 Question

[awh03G35s]

I'm thinking about replacing the factory HU in my '03 G35 Sedan with the AVIC-D3.... anyone who has done one of these conversions, could you please help me out with what parts I'll need?

I know i'll need the new trim piece for the dash and the A/C control unit, but what about the installation kit the new HU actually fits into and wiring harnesses?

Anyone know these part numbers and where to get them from?

I'm fairly experienced in car audio installation, but this is my first Infiniti and I don't want to mess it up, so would this be a weekend project, or would I need to take it to a shop?

Thanks for your help.