Do I twist or pull them off
I tried by hand and wasnt getting anywhere so next step is going to be the pliers and i just want to make sure im not breaking it.
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In some (not all, depends on the crimp style) cases you can use pliers (or locking pliers such as vise-grip) to squeeze an "oval" or "flattened" crimp on the long axis, and that will open the hole enough that you can slip the wires out. If not, yes, you have to cut them off, as per the comment that @Steve should make into an answer.
If that does work, you still should plan on new connectors for whatever new wiring work you are doing, as "recrimping" used connectors is not very reliable.
These are single-use crimps and you surely will destroy it. I understand not wanting to waste any wire length, but prying them apart is a hard fight... not worth fooling around with, just cut them.
But look closely at where the metal part of the crimp actually is, and cut just below it, right through the plastic and all. That way you're only losing 3/8" or so.
Replace with wire-nuts or stab-and-lever splices.