Assuming you have a 7M-GTE it will be moderately hard. The front knock sensor is somewhat easy to put the connector on it. The second one near the back of the motor is pretty damn hard but not impossible to put on without taking anything off. I've done it. You wont be able to see the connector so you will have to do that one by touch alone without taking it off. I did the front one from the top of the engine bay and the back one from under the car.
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