How do u install a car radio?

How long is a piece of string? Some are extremely easy to fit, others are very complicated. You haven't given any indications as to your own competencies with installing automotive equipment, nor any details of the vehicle and the type of equipment you propose to install. What is certain though is that even the simplest example can cause a car fire or at least a flat battery if it's installed incompetently.

ot to hard with the right tools and instructions. Crutchfield will supply all the accessories and detailed instructions for your specific vehicle if you purchase from them. http://www.crutchfield.com/p_700MASTER/Crutchfield-MasterSheet.html?tp=643

Depends on the car. In many cases, you just need to purchase a few adapters: a mounting kit to make the new head unit fit in the dash like the old radio, a wire harness adapter to connect the new deck to the factory radio plug, and possibly another adapter for the AM/FM antenna connection. Usually the most difficult part is removing the factory radio. Sometimes you have to do quite a bit of disassembly to get the old unit out; in other cases you can pull the stock radio right out of the dash with a set of removal keys. It varies wildly from one vehicle to another. The mounting kit should include instructions for your car. In some cases you'll find factory amplified systems, data-controlled factory radios, steering wheel controls and other complications that might make the installation more difficult or more expensive. Post the year and model of your vehicle, and we can give you more information. P.S. Don't trust anyone who answers "yes, you can do it yourself, it's easy" without knowing what kind of vehicle you have. There are some cars out there that really require a professional installer. And if you're going to have someone else do it, go to a pro. Don't let an amateur work on your car; if he gets in over his head and damages something, you have no practical recourse.