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Having done a few that are working, this is what I did.
Unplug the batteries (for saftey reasons of the electronics).
unplug the pcm and and remove any screws holding it in the firewall.
unscrew some of the wheel well plastic and use and pry bar to pry it out of the way of the pcm sliding out of the firewall. Be careful not to bend your fender.
Once the pcm is removed, make sure you are statically discharged (touch a ground source). Remove the screws and open it up. On one end you'll have electrical connections that look like old school nintendo and atari catridges. Use a razor blade to CAREFULLY remove the wax. clean up any residual wax with rubbing alcohol. Use the razor blade to rub some of the 'silver' off of the connections. Drag the razor blade over the connections so that it is NOT cutting into it. Once that has lost its effectiveness, use a small flat blade screwdriver (think eyeglases, etc.) to rub as much of the remaining 'silver' off as you can. You'll have to do each contact individually. Do both sides of the PCM. You want to expose as much copper on the contacts as you can.
Be careful not to slip and cut into the circuit board with anything as this may permanently damage it.
Connect the chip and it's controller. Remove the interior panel covering the parking brake. Start sliding the controller through the PCM's opening in the firewall. It should appear near the parking brake. Gently pull on the controller while someone else inserts the PCM back into the firewall. Be sure you put the PCM back in the same way it came out. Screw it in, reconnect the PCM and battery. Fire it up and test out the chip.