Reprograming remotes (key fobs)

I read the instructions below on one of your threads about the DDM. Excellent article! Outstanding troubleshooting steps! It's my exact problem.

I'm getting ready to replace my DDM.
1. Should I disconnect hte battery before I hook up hte new DDM? And,
2. When performing the steps below, since I have the auto headlight ON feature, should I turn this OFF? I.E. Keep the headlights are OFF?

"To reprogram the remotes was a snap. Here's the procedure.
WHILE INSIDE THE CAR, WITH THE DOORS CLOSED,
TURN THE IGNITION FROM OFF TO ON, 4-TIMES (WITHIN 3-SECONDS), THE LOCKS SHOULD CYCLE.
DEPRESS ANY BUTTON ON AS MANY AS FOUR REMOTES (LOCKS CYCLED TO CONFIRM).
RETURN IGNITION TO OFF POSITION. YOU'RE DONE."


Thanks for your help.