I strongly recommend the following resources to help you get technical help fast. These will be useful if you need help removing or installing a radio. If you don't know how to remove the surrounding dash pieces to access the actual radio itself or you may need wiring help, these should help you get a speedy answer.
Car Forums:
These can be a fantastic source of techincal help and information and i can guarantee that someone online has done what you are trying to do and will love to help.
Haynes or Technical Manuals:
If you don't have one for your car, borrow one from the library, it's free. Great for showing you how to access radios and other hidden parts of the car interior and exterior.
Radio Handbook or Manual:
Very useful if you are looking for the model number or name of your car radio in order to find a suitable, compatible changer or iPod car kit. In the radio manual they may also list compatible changers. However, bear in mind that the model / part numbers listed may have been superseded by newer models. Contact a car audio shop for these details.
Car Dealership Service Departments:
Ring your local car dealer and ask to speak with a technician, if they won't help ring another dealer from the Yellow Pages. Since you are a potential customer, some car dealerships will want to use this opportunity to build a relationship with you.
You may have to exercise some patience as some of this service departments can be swarmed with work. If you persist, you'll certainly get the help you need.
