Anyone done this? How difficult is it? I can handle installing an aftermarket stereo if I have provided harnesses. But I'd be a rookie when it comes to soldering or splicing into the cars wire harness. I'll be installing a MVH-8200 with XM receiver. And I would miss the wheel controls. Will the Axxess harness replace the current radio/auto harness? Cause there will also be a Crutchfield supplied harness. Thoughts?