Like others, I damaged my digitizer cable while doing a battery replacement. It would be a good idea to use some blue tape to mark the spots to avoid during the glue slicing procedure.
I found it much easier to use a single edge razor blade instead of the pick. After getting that inserted, it was easy to slip the pick between the blade and the case. Disclaimer - Razor blades are very sharp and you could easily hurt yourself or your iPad if you use one.