An indoor trampoline comes down to one careful task: releasing dozens of springs without a snapped-back injury and without losing track of a single one. Do that patiently with a spring tool and the rest of the breakdown is routine.
Pro tip: Count the springs as you remove them and again as you bag them; knowing the exact count in advance means you will immediately notice if one goes missing.
Watch out: Never release trampoline springs with bare fingers; use a proper spring tool, since a spring can snap back with enough force to cause a serious pinch injury.