[Nexus 7 Q&A, Help & Troubleshooting] phyerbert:
Ok I've been doing this repair here's a brief novel for those who go after me and some questions about where i went wrong.

Removal

Seperating the glass from the lcd was not that difficult. a guitar string works great. I used a blow dryer to heat the glass and then pulled the guitar string back and forth to saw through the glue, this took a long time and i broke 2 strings in the process, I had the blow dryer rigged in a vice to keep continual heat on the glass, I was afraid of burning something, so i would move it in and out of the heat using my judgement to keep it warm but not too hot to touch. the glass was broken so I didn't have to worry about any further breaks although I was careful about not scratching the lcd as i pulled shards off.

Once I had the glass off i had a thick mess of hard glue on the lcd to take care of. I tried a ton of stuff on this: lcd cleaner doesn't work, heat didn't really work, after a lot of experimentation i found that if i rubbed it with my thumb i could sort of peel it back, once i had a little ball of glue removed I found that i could dab it against the glue on the lcd and it would pull up, like when you're cleaning the last bits of sticky tack off something. This was the most effective for removing the thick layer of glue, then i used lcd cleaner to wipe the residue left on the lcd until it was perfectly clean. even with only a little residue left, this was still a long and tough job.

At this point I had no idea if i'd broken my lcd yet i'd been at it about a month now.

The new glass

This is a funny story now that I'm not in the middle of it. so I had some Liquid Optical Clear adhesive from amazon. After watching a few different videos of how to put it on i made my first attempt. I put glue on in an X pattern but with 2 more prongs across the middle of the tablet (like and X with a - thorough it). and slowly lowered the glass on, watching carefully for bubbles. I lucked out! no bubbles! I had purchased a black light and simply suspended it over top the glass to let it cure up the glue. I had no idea how long the glue took so i left it an hour. In that hour i began to worry about alignment, and how I could be sure the lcd was glued on teh right spot. So i went after 45 min to see if i could shift the lcd without breaking the bond or causing air pockets. After testing with the plastic siding i discovered that I had glued the lcd not only misalighned, but I had also glued the face surface of my glass to the lcd. Got the blow dryer out and removed the glass again, this was a much easier time to remove the glass, but new optical glue is actually much more of a pain to remove than the old stuff, leaves a greasy residue everywhere.

Attempt #2

Having learned from my mistakes and after getting everything clean again, i took another shot. This time i fit the glass into the plastic rim that it will sit in in the complete unit. This allowed me to position the lcd in the right spot. I triple checked the glass was facing the right way up and applied glue. This time i had a couple small air bubbles that i couldn't press out. In both attempts i think i applied way too much glue and had a big mess to clean up after. But I got it on and in the right position. Cured it up with the UV light for 90 minutes, then set it in the sun for the afternoon to really get the glue set up (uv rays set up optical glue in case that wasn't clear).

Result

I haven't finished yet, I'm waiting for some new adhesive tape because my plastic rim doesn't hold very good and i'm afraid of the glass falling out, but i peiced it together and turned it on and i have a couple issues. the screen is really dim pretty much all the way across and then bright on the side opposite the power button. I don't know if this is too much glue or if my glass and lcd isn't pressed tight enough to each other. If anyone has insight to this let me know. I'm thinking I might take it off again, i have enough glue for one or two more cracks at it. I'll try to come back and share my future endeavors with this.

In my case this isn't my tablet, but the owner isn't really concerend if i break it, he just wanted to try fixing it for 30 bucks instead of a complete replacement.