I just performed the replacement of the digitizer and LCD display with a swap of the camera and home button. This went well following the directions. About 30 minutes of my time including a short break in the middle to rest my eyes and take a few deep breathes. :)
BTW, I did not disconnect the battery but made the sure the device was off. "Power button and slide to off across the top of the display" I then put the hold switch on so nothing was accidentally powered back on.
Those of you having digitizer issues after completing the replacement are more than likely not getting the digitizer connector properly seated. It's very important you feel them snap into place. If you don't get that little click, it's probably not connected correctly. It's also possible you pinched a cable when closing it back up. This has happened to me before and it never did completely recover until I bought another replacement and installed it correctly.
Great instructions! Yes, difficult but not the worst I have dealt with. Thanks iFixit dot com.