I need to replace the battery on my 2001 excursion. I heard there is something that has to be reset involving the smog. is it something that i can reset myself?

If you have a battery charger and a friend[extra set of hands] you will not have to reset anything including your radio presets. remove battery hold down, loosen battery terminal bolts, hook battery charger up to terminals, have your second set of hands hold the terminals up and out of the way with the charger still hooked up to them, lift out old battery, put new one in, put terminals back on and disconect charger. tighten terminals and put battery hold down back on.