How do you remove a heater core in an 1992 achieva without setting off the airbags?

Airbag deployment (when not actually in an accident) scares me, and I try to stay away from them. I've never tried this procedure myself, but check out what they have over at AutoZone.com about disarming the supplemental restraint system:

http://www.autozone.com/az/cds/en_us/0900823d/80/0e/58/fa/0900823d800e58fa/repairInfoPages.htm