If it was me, I'd do it in "zones" too - don't just start loosening on one end and work to the other, keep things balanced as you take tension off the frame. Maybe over-cautious, but doesn't cost anything more to do it that way. Take down a high one, a middle one, a low one, and lather/rinse/repeat until you run out of stress.
Stored energy is an amazing thing...
Dave Hinz
Might I suggest (from a position of profound ignorance) That you take a petrol/gas abrasive saw with you if you can get hold of one. Then you can nick the frame where you want it to break before you start hitting it with the sledge hammer.
Mark Rand RTFM
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