I have a 2004 honda elantra and I want to put cruise control in my car and I want to know the price to put it in and will I be better to put it in myself or take it to someone?
That's controlled electronically, so that's probably not possible.
There are any number of aftermarket cruise control kits specifically designed for or adaptable to your car. It's best to have a mechanic do this job because of safety related matters.