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Best way is to use the jump posts under the bonnet sorry hood as previously said but only if one terminal is still on the battery not both off and touching the body to create a short. The horn going off is probably a wire shorting again as previously said.
I would pop the airbag off while the battery is off then sort out a jump on the front posts then drive it home without the airbag so you can get your head together and diagnose it in your own time when back.
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