Selling my vectra next week with a CDC40 radio and buying a newer vectra next week with a CDC30 radio, want to keep the CDC40 radio so want a step-by-step guide in un-installing it and re-installing it into the newer vectra. How do I go about? What codes do i need? Where do i get them? etc. etc. not a technical person so basic words/no fancy thrases or nicknames for parts please