I used a small, thin piece of rubber to slide the ribbon connectors right into the housings... easy as pie. This screen swap was pretty easy, and saved a great camera from the trash bin. I have beat the snot out of my S120 and it just keeps on going. A superb little camera.
Thanks for the instructions!
P.S. - don't forget the little black piece of protective paper that goes under the upper right edge of the screen and sticks out to cover the top connector ribbon at the point where the metal bracket holds it down. My new screen did not come with one, and I found the original after I had reassembled the camera. Had to open it back up to reinstall that.