its not that hard to do it to test the wires. get a multimeter see which ones are hot when the car is off that will usually be your yellow wire on your headunit. and when the car is switched on and you find the 12v that is your red. and find a good ground spot for the black wire. to test the speakers find a flat 9v battery to test for the speakers when the postive wire from the battery is on the positive side of the speaker and the negative is negative the speaker should pop outward if you have it backward then it the wrong way around to find the right phasing. its really not that hard. Or you could have me do it?