Ooo, man, be careful here.
I was once able to change a timing belt on a Korean-built Pontiac. And when
the dealer did it, it was a very uncomplicated $70 job. But that engine was
not an interference engine, and there was plenty of room to work - you had
to move or remove virtually nothing to get to it. I think the same is true
of the old VW Fox engine.
But this is an interference engine in a much more cramped area. It will
still be easier than some V6's I have had to face, but you have to know what
you are doing.
If you don't yet have a free HMA account, get one. All the schematics you
need should be in there. In fact, for a job like this, I myself probably
wouldn't settle for less than actually buying the Elantra service manual.
It makes sure you do the job right.
Also consider changing out the water pump while you are at it. You will
virtually have it in your hands to get the belt off, making replacement
fairly easy - and about the only time you would want to do it. The part
(and necessary gasket) should be able to be had for less than $50, almost as
cheap as the timing belt itself, according to my research.
Finally, take a long look at the condition of the timing belt tensioner
pulley. Just to be safe, you may want to go ahead and replace it
regardless - like the water pump, that is the only time you would ever want
to replace that. Some auto parts stores sell a timing belt component kit
that has the belt, the pulley, all you need for the job(except the water
pump and gasket). I think the security is a small price to pay.
Hope this helps.