The job is not difficult but can be time consuming if doing it for the first time, a lot of parts need to be removed. Download the appropriate service information from the link below and also read the treads at the bottom of this page.
There are two timing belt pulleys. Some owners also change the crank and cam seals but might just check for leaking (also check the oil pump seal). Would also be a good time to check all the other belts as they will need to be removed.
One issue removing the crank pulley bolt requires holding the crank in place. Be sure to double check the crank/cam timing one the belt is on. Do this by rotating the crank 2 times CW and rechecking the marks.