Upon the reinstall of the new screen, is new adhesive required? If so, where does one source this - not listed in the parts store (after a search for Surface Pro)?
Your comment saved this project for me. This guide, as written, woefully underportrays the difficulty of not damaging any of the ribbon connectors for this step. You are MUCH better off separating the hinges (The Retro Gaming Repair, paired with YouTube videos, are a great resource) and working the ribbons through the metal hinge liner and the wide slot than trying to worm the new screen ribbon through the hinge liner and much smaller hole while still connected.