In all of the installs that I have done, it always seemed that the release pin on the MCM computer connectors were positioned so you had to have double jointed wrist and fingers to make them release while prying out the connectors.
I finally have found the most natural and easiest position for getting those babies out.
Remove the spare tire, and stand in the tire well. Bend over and reach your left index finger over the wires, and onto the release catch. A simple twist of the tool, and the connector is out.
If your MCM connectors have never been removed, they can be quite tight. The MIMA upholstery tool also works nicely to pry out the connectors, but only if the release tab has been fully released.