Jo, the link you posted for the timing belt replacement didn't work for me (maybe it's my work computer).
I am guessing that you are linking to Bart's timing belt replacement how-to. I followed that thing to the letter and had no problem replacing my timing belt. Like Billy said, it is a weekends worth of work (maybe a long day if you push it), but it really isn't that hard. The toughest thing for me was getting the nut off of the crank shaft pulley off. Used the ol' "rest the breaker bar against the frame and bump the starter" trick and it came right off.
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong, it usually turns out to be impossible to get at or repair."
-Douglas Adams, Mostly Harmless