2000 Sonata clockspring: how big a job to replace?
 

The airbag warning light on a friend's 2000 Sonata GLS has been
lighting up, and his mechanic says the code coming up is for the
clockspring.

How big a job is it to replace this? Bearing in mind of course that any
servicing of the air bag has to be done carefully, is this something
reasonable for the shade-tree mechanic to attempt? Is the part a
dealer-only item, and what's the cost?