Been several years since I read this thread, and bought the lens from 3dlens.
I finally got around to it today. Went pretty smoothly, and I"m happy with the results.
I had a few issues - but nothing show-stopping. I had some glue residue on the screen from removing the polarising layer - and some polarising bottom layer got left on the screen when I was peeling it off- requiring *very* careful removal with some 99.9% isopropyl wipes (thankgod i do electronics repair as a hobby). I also unfortunately had some permanent damage to the LCD layer from the extremely damaged polarised layer - which left some marks on the screen which could not be removed. However, once the new polarising layer was put on (be careful with that direction too - cos for me, it changed when you remove the protective layer) - and then the glass layer - it was barely noticable.
Overall, a pretty straight forward project - and I'd recommend it to anyone who has an MFD with still a 20 year-old screen. Do it as soon as you see any weirdness - as the polarising layer is breaking down and may damage the LCD. I'd post some pics, but honestly, the first post covered everything required. The only other thing of note was I used some thin sellotape double-sided material to hold the top glass/plastic layer on - as its what I had handy - and is very thin and durable (it's white on the outside with blue writing saying 'peel backing to expose adhesive').
Oh - one thing for anyone who cares - the the size of polarising film I cut out was 75mm x 130mm approximately - to give anyone in future an idea how much material you need. I bought the matte 17" stuff - and it looks great, and had plenty of material leftover - especially handy as I did get caught with the polarising film being the wrong direction the first attempt. It pays to double-check these things