1995 caprice rear deck

A friend of mine is trying to install new 6 x9's in the rear deck of his 1995 caprice, and has asked me to help him out.

I have not yet looked at it, however i was wondering if there was anything special i needed to know about getting the factory 6 x 9's out and replacing the with new 6 x 9's.

Or if you have any diagrams, or know of websites that show you disassembly of the rear deck, it would be appreciated. Thank you.

Not familiar with rear deck on 91-up, but I haven't seen a full size car yet that didn't have the holes in the metal part of the deck already there (meaning all you have to do is cut the deck board - you can easily do it with the deck in place.)