It's really simple to do. Start by removing the black plastic skid plate. Looking up from under the vehicle at the belts you will see two belt tensioners (one for each belt). First you want to loosen the nut on he front of the tensioner pulley, just loosen it, don't back the bolt all the way off. Now you want to start backing out the bolt on the bottom of the tensioner bracket, this bolt may be a little stubborn and a little squeaky. As you turn that bolt counter-clockwise you will see the tensioner pulley start coming down and loosening the belt. Once you have it loose enough to remove it just pull the belt off. The alternator/fan belt will need to go around the fan in order to be removed and replaced. Also, remove the alternator/fan belt first and then the A/C compressor belt second. Replace the A/C compressor belt first and then the alternator/fan belt second. When you replace the belts, just make sure they are routed properly and then you want to start tightening the tensioner bracket bolt until the belt is tensioned properly. Once it is tensioned, tighten the nut on the front of the tensioner pulley.
This job should take you no more than 20mins. to complete; here's some pics to help you with locations and whatnot.
