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Your odds would be about 1 bad out of every 10 ends you crimp until you get the hang of it. You should always use an in-line tester to verify that each wire is correctly crimped and has continuity.

You MUST cut it off and crimp on a new connector. They are not reusable. You will need a special crimper to do it right.

It would be cheaper and easier to buy one already made for you.