Ok guys, hope this helps everyone. Moderators, can we make this a sticky?
Step 1. Remove the bezel around the shifter by lifting the rear of the bezel like so.
Step 2. Remove the (2) screws holding the radio panel in place.
Step 3. Remove the panel by pulling it towards you. The top of the panel is held in place by (2) clips. Do not just pull the bottom. Instead, pull out the bottom, and try to pop off the top section with a small flat-head screw driver at the same time. It should pop right off.
Step 4. Remove the (6) screws holding the CD player in place, and remove the CD player.
Step 5. Unclip the factory harness, remove the antena, and the grounding clip on the right side. Solder together your harness adapter (the one you picked up from the store for a 90+ Subaru) and your new aftermarket CD player wiring harness. All the colors match up.
Step 6. Now, clip you harness adapter into the stock harness you had removed from the rear of the factory cd-player.