Before you even begin, if you are doing this in the car with the battery connected, please disconnect the battery. Dont want to short out the injector wire as it has a constant positive whether the key is on or off.
Alright first step is to remove the orange clip that holds the wire pin securing clips tight on the pins. This clip also seconds as a guide into the injector to keep a tight fit as well. Basicly pry the tab of the orange clip located on the release clip of the injector connector. Dont pry too hard or you will break it.
Then once you pry it foward a bit quickly move to the side and stick the flat tip between the side of the connector and orange clip and gently pry or twist the flat tip upwards and it should pop loose and out of the injector clip. If it doesnt give the tab another pry or if you have two tools to pry with you can work with both.
Then your left with just the orange piece that comes out.
Next take a needle or pin that is small enough to release the wire pin securing tab and strong enough press downward on the pin to push it down clearing the securing tab. All you got to do for this is push the pin or whatever your using between the black securing tab and the wire pin and then pry down on to the top part of the wire pin. This will push the pin down while keeping the securing tab away allowing it to release from the clip.
Then once you pry down pull the wire out or just out enough so that it doesnt go back in place while you do the next one.
Then remove the wires completely from the connector. They will only clip back into the securing tabs one way. There is a flat side of the pin and just look at it as you remove it and you can tell how it goes into the new connector. Also make sure if you are doing this on the cars harness please disconnect the battery. If you short the positive to anything metal it will spark and possibly blow your fuse. I believe its one of your engine control fuses. Not exactly positive. Id have to look at the diagram.