Here’s a short video I made last year (set up in a hurry – apologies for lighting) showing how I replaced a badly scratched LCD screen cover on my Canon 5D camera.
I bought the replacement window kit from ebay ($25 from uscamera), which included the new window and the adhesive tape.
You will need a hair-dryer, to heat up and soften the adhesive; a thin knife or similar sharp edge for levering out the old window; a suction cup (optional) to help with the removal of the old window.
This isn’t supposed to be a definitive guide on how to repair a damaged LCD window, just a record of how I did it. I hope you find it useful. Any questions, please ask.