The screen is broken right? He'll make no more mess taking the old screen assembly out and trying to put in a new assembly, than he would have with a broken screen
The only issue is the adhesive, but as long as he uses VHB strips of suitable thinness he'll be fine! Too many timid people in this thread - the screen is bust - plugging in 2 connections and using suitable adhesive is not the same as soldering a new chip.
The chap didn't ask if it would be tricky, or beyond his abilities. Removing the screen intact would be a *****, if it's broken, easy. His is broken!!! Placing a new one in is simple.
When Microsoft warranty expires and people are repairing these machines more often, then screen replacements on already broken screen surfaces becomes simple adhesive and connection job. Let's face it - he's not attaching a new touch layer to his LCD.
I recommended going with Microsoft because the cost doesn't make sense at current prices for the part.