CD Changer/FM mod. Install - 2001 Blazer

I'm looking to add a CD changer to my 2001 Blazer which has a FM modulator as it's means of "hook up" to my current factory AC Delco/Bose sound system. Does anyone have any idea how difficult it will be to access the antenna plug in the back of the radio to connect the FM modulator? Is there anyplace on-line where I may find some diagrams to help me with this install? Any help will be most appreciated. Thanks!
Russell