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?
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I don't know whether you can obtain parts aftermarket, but it's a pretty simple repair.
1. Disconnect battery. Do not begin work until battery has been disconnected for 10 minutes. 2. Remove the air bag (two screws, I believe). 3. Center the steering wheel. 4. Remove the steering 22mm steering wheel nut and rock the steering wheel from side to side until it comes off. 5. Remove the column covers. 6. Remove the clockspring (4 screws). 7. Reinstall in reverse.
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