Audio Systems: 2000 Ford Taurus, ford taurus, cd connection

Question
Hello
My 2000 Taurus has a radio only(not even a cassette player) and I would like to add a single (basic) CD player. I've looked on E-bay, they show one & it say w/warranty. My question is would that be all I need to get?  Do you just  take the old unit out and plug the cd unit in??  or do I need Step-by-Step instructions   (I just want to play my CD's I've invested in- Thanks for any help.

Answer
yes you switch unit  radios all are the same no problems
what you have to look very close is the ac controls they are all not the same
you can alsop leave the radio there and plug a cd changer  in the trunk  cd connection is ion the trunk  left side under the carpet