How do I get into the dash of my 98 deville to swap radios? Also, do I need a different faceplate to switch from a stock 98 cassette to a stock 99 cd/cassette combo?

The dash panel pulls out by hand just above the ashtray the the radio pulls out by the 2tabs on the side, should take you all of 5 minutes max to swap radio's...........taking your time:cool2: