Managed to repair a few of these over the years... my 3 kids al had 6th gen's and 2 had cracked glass (digitizers) that I've done... today I did an LCD swap for an older one at work that had backlight strobing. No issues with the repair. Heat gun for adhesive along with the Anti-Clamp (great tool btw) and a iSesame opener tool... didn't bother with the battery disconnect. Just removed the LCD bracket/cable and installed "new" LCD I purchased from iFixit... though it was clearly used... it did have a plastic film on the screen but was VERY dirty on back and had old adhesive on it. But it worked fine. I did pick up a new digitizer in case I broke the glass removing the old one, but didn't need it. I had some extra adhesive laying around that I used to replace some of the marred adhesive from opening this one up. All-in-all, pretty straightforward ipad repair. And yes, had the glass been shattered, it is a MUCH longer and annoying repair. Been there before. Take your time cleaning it all up first.

Maybe the guide was improved since the above comments were made, but I found this guide completely thorough and have used it on multiple machines without issue. Thanks!

You don't need one if you have other means of attaching your 2.5" SSD to the back wall of the iMac case (like industrial strength Velcro or 3M VHB tape), but the bracket you mount into is a 3.5" space for a full sized desktop drive and SSDs are 2.5". Thus the adapter... just to mount the drive into the bigger bracket area.

This guide is way more than needed for the display replacement. Until it gets edited down, all you need to do is steps 1-3, 12, 22-24, 28, 31-35 from the "upper case replacement" guide (which is apparently what this guide is right now, instead of a display replacement guide as it is labeled).