It's ok to disconnect the DSC button, even with the battery connected.
In order to remove the metal trimming, you have to remove the passenger side one first. Just stick a screw driver in the gap on the bottom or on the right and push forward being carful not to damage the dash. There are not screws, they all snap in. You have to buy a special mounting bracket in order to move the ac down. They are available at the dealer for about $50. Keep in mind that there are 2-3 different brackets depending on what type of option you have on your car.