I looked into this sometime ago and it is really difficult.
My brother in law has just re-registered a car and the amount of paper work is horrendous.
There are people who specialise in this service and you will them in the free local papers or Costa Blanca news.
I think you very definitely need an NIE before even starting
i also think that even though the car is coming from within the EU you will have to pay some import duty.
I think from previous postings on this subject most people dont bother and just buy a spanish car.
Sorry to be the bearer of bad news!
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