It helps quite a bit to peel the black plastic block off the aluminum case to give you the room to work with the home button cable on reassembly. Lean the new digitizer against something so it's at a 90 degree angle to the bottom case to help line up the cable connector to the ZIF socket. Use the tweezers on either side of the "neck" of the cable to encourage it back into the ZIF socket; it doesn't require too much force.