thats easy, shut everything off, in your case pull radio fuse, hit ebrake to kill parking lights, then key to run, engine off, doors shut, dont touch jack while it reads.

hit pcm flash, then read pcm, then read PCM. it will open a save window when done save it where you like and name it, make a copy of it and store it name it dont touch lol turn key off open the door, dont trry to start it for 30 seconds.