After fixing my sister's iPhone, she pulled a smashed iPad from her closet. It was in a bubbly green foam "protective" frame that had obviously been no match for her toddler son. She had not used it in years and thought my son and I might be able to do something with it. We were eager to put it on the wall in our kitchen, if we could fix it. Off to ifixit we went!
The repair was the most painstaking we have ever attempted. We had a lot of glass to clean up, and because it was so shattered, we mostly had to pick it apart rather than lift it off. The iPad was also so severely dented that we had to try straightening the aluminum a bit and then trim off a portion of the bezel to get the new digitizer comfortably seated. Luckily, we knew the pad was destined for life in a case on the wall, so we were comfortable making these changes.
Patience. This took careful, slow work removing each bit of the shattered glass. It required special care to prevent damage to the wifi cable and camera. The guide was a huge help to us. The advice to tape up the glass to limit flying pieces was especially helpful. The excellent tweezers included in the tools ifixit supplied with the digitizer fix kit were our primary tool. We used these to pry up and then remove pieces of the glass. We also found a heat gun more useful than the iOpener for softening the adhesive.