Whew mission complete. The hardest part for me was getting the keyboard bezel off. I was afraid of breaking something. I did pop the End key off when the spudger slipped, but the key was easy enough to pop back on.
What might cause you issues is seating the new memory into the slots. I had to seat them a couple of times to make sure they were all the way in the slot. If the side locking tabs are not equally below the half circle cutouts on the sides of the memory then that's a good indicator that the memory isn't properally seated. Slot A was tougher to tell if it was seated properly.
All in all this guide was a huge help. Probably not the easiest procedure to complete but this guide helps tremendously.