1992 Isuzu Rodeo R&R Heater Core

I need to replace the heater core in a 1992 Isuzu Rodeo. I have almost got the dash out, hung up by the wires that go to the ECM. Is there a special
tool to unplug these terminals? Is there a problem with unplugging them?
I would sure appreciate feedback from anyone that has tackled this.
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