it is a matter of tering down the front of the motor to gain access to the timing belt. it is involved. you should also do the water pump. all puleeys and tensioners, serp belt, thermostat and new coolant while you are there.
You can find great repair manuals with step-by-step instructions, diagrams, parts locations and other important information here: http://www.eautorepair.net/Marketing/Default.asp?VID=125669 Make sure to follow the instructions.