Need Experienced Help
 

I'm new to the Cadillac world, and have recently aquired a 1988 Fleetwood Brougham.....I'm wanting to replace the speakers in the dash, and need to know, does the dash HAVE to come out? If so, how to go about this?
Can the speakers be removed from the top? I need some advice from someone that has been here, done that. Positive constructive feedback encouraged. Thank you.