I feel your pain. However as it's ready to go I would connect it up as it is for now , bunching any excess wire somewhere temporarily. This is so you could check everything is working as it should. You could then, at your leisure, shorten a few at a time over a period of time and it might not be such a ball ache. It might even facilitate some finesse to the job, which may not be apparent if you do it all now.
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Contents may settle !
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