Something that will save you a lot of pain and heartache is knowing how to properly pair the Kwiksets...
Under the rear panel of the lock, there are two white buttons on the top. The left button is the "join/pair/enroll" button, the right button is for "disband/leave".
Now, you would think you would just hit that button once and be good.... oooohhh no.
For some reason, the bizarre sequence you will need to do is:
Press the right button 9 times (yes, nine). You will see some small LEDs under the plastic cover blink each time you hit it. When you get to the ninth press, a second LED right next to the first LED will briefly light up. This disenrolls the lock from any previous networks.
Now, place the ZIM in setup/enroll mode.
Finally, press the left button 4 times. Watch for the same LED pattern, with the second coming on with the fourth press.
Hopefully you luck out on the first try and it enrolls. If not, start all over again.