I've done 3 iPad screen repairs so far.
The first one I ever did was the hardest, but the screen was also really shattered. The second one I did the screen was intact, I just had to remove the screen to work on the home button. That repair was relatively easy.
My most recent repair was alright. Just one corner of the screen was cracked. It was ok until the rest of the screen started cracking up on me as well. Luckily I had most of the glue released so I didn't have to deal with too many fragments of glass.
If you're looking at removing a lot of broken glass slivers it's going to be a pain in the ass.
I use a heat gun and a razor blade to get started on removing the glass. The razed blade fits between the glass and the plastic bezel piece better than any of those cheap plastic opening tools I've tried. Start prying a little ways down from the volume buttons. Get enough of an opening where you can fit a thin guitar pick in there, I think I have some .50 mm? ones I use. Lots of heat and just work the guitar pick around the edges, use other guitar picks to hold the loosened areas up away from the glue once you move past. I have thicker guitar picks I use for that. You'll have to check ifixit to see the areas the avoid going too deep with the pick: wireless antenna, home button, camera, near the volume/mute buttons. You might have a hard time getting the broken glass pieces away from those areas so there's a good chance you'll tear the wifi cable and power/volume cable. I know I did on that first one I tried.
Wearing rubber/latex gloves helps so you don't leave finger prints all over the LCD or new glass panel during replacement. Most importantly: wear goggles!! You do not want a tiny piece of glass getting in your eyes..!
Hope this helps. Good luck.