Crutchfield is probably the best source for buying aftermarket stereo components. They should have included detailed instructions specific to the VX.

In addition, Crutchfield makes factory interconnect "wiring harness adapters" that prevent you from any cutting or slicing wires (thereby preventing you from destroying the factory plug-in wiring harness). It's a wiring harness adapter that goes inbetween the factory OEM harness and the new aftermarket stereo harness. Genious.

They also make speaker wiring harness adapters as well, so you don't have to cut/splice any speaker wires. Get back on the phone immediately, and speak with a Crutchfield rep about instructions and specifically the "wiring harness adapters"!!!