Mazda Forum : “2005 Mazda 6 console”

Should be able to just pop off the trimplate around the radio carefully and then unscrew the radio.

this is not really a "do it yourself" project. the 6 has a lot of overlaping trim peices and a few hidden bolts. (you do need to remove the glove box, to get to one or two hidden bolts)
if you live in WI near Milwaukee contact me, i can attempt to help you out in person