can't get much "newbier" than me.. but I'll take a wack before you get hit with the "do a search" mantra. I didn't disconnect the battery. There are 2 tiny "doors" on each side of the unit faceplate... look closely. Pry open with a super skinny, padded screwdriver... accessing the screws. Use your provided wrench.. asssuming it's right... not really a hex... and loosen the screws until the unit comes free. You'll need the code.