You guys are such wienies. Why is everyone so damn afraid of voiding their warranties? They have to actually prove what you did was the cause of a malfunction. Then if the warranty claim is denied, it's not as if your car no longer has a warranty.
Story time kiddies. If you change your struts in your car... and then you start having troubles with the upper strut mount. You bring your car to Ford and they tell you "sorry Mr. Youshouldn'thavebeenworkingonyourowncar because of your unauthorized modification to the strut assembly of this vehicle, we can not approve your warranty claim." So you will pay out of pocket for this repair.
NOOOOOOOOOOW... 2 weeks later, the motor in your driver side window stops work... There is no feasible way they can link your suspension modification to the failure of this window motor, hence they have no basis to deny your warranty claim.
So to answer your question... the typically procedure is to remove the airbag fuse and pull the negative battery terminal. Once you do that give it at least 20 minutes and some recommend to press the brake pedal to completely drain the system. The pyrotechnic squib is of course still in the airbag, but with out an electric charge to ignite it... you should not be in risk of blowing the thing off in your face.
Remember folks... just because you're too scared to do something.... doesn't mean it can't/shouldn't be done.