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The airbag is retained by two Torx T30 screws accessed from the instrument panel side of the steering wheel. You'll want to use a 1/4" drive ratchet and a short (3" works well) extension to remove the screws. The screws are usually in very tight and you'll want the 1/4" ratchet and a good T30 bit. You'll have the insert the bit and 1/4" extension and feel around until you have the Torx bit securely in the screw. I usually tape the extension to the T30 bit so it doesn't get stuck in the hole in the back side of the steering wheel. The steering wheel foam fits tightly around the 1/4" extension, and you aren't likely to get it out if the hole if you haven't taped it together.
Once you have the airbag removed, remove the steering wheel. There is a Torx screw, with a yellow tag (with instructions on it) to use to hold the indexing of the clock spring. Even though you say the clock spring is bunged up, I would use the screw. When you are removing the steering wheel, don't allow it to turn as you are removing it's retaining bolt, or you'll bung up the clock spring even more. Once you have the steering wheel removed it should be obvious what to do next.
You might be able to re-index the clock spring and save yourself an expense. If not, buy a clock spring that has been properly removed with the indexing screw in place.
The airbag is activated by 12 volts, and there is no power to the clock spring and connector unless the SRS module has detected a front end collision. I have probably removed and re-installed airbags over thirty times, and have never had a problem leaving the battery connected. In order to deploy the airbag you have to experience a forward collision with the key on. A very unlikely scenario when the car is parked and you are working on the steering wheel and airbag.
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john
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