Thanks for the write-up on how to do this. Have a P0302 code, before I change plugs I figured I'd swap the injectors on cylinders 2 & 4, see if the code moved.
Ran into trouble getting a grip on the injectors to pull them out with pliers, noticed the holes on each side. Figured those were probably used for a specialty tool made for pulling the injectors, so I made a puller out of a heavier duty coat hanger and one sturdy zip-tie, worked like a charm.
Having trouble attaching pics today, so here's a description of how. Use one of the hangers that has the cardboard tube, discard the tube. Cut off both bend ends so you have two equal length straight pieces connected by the curved hanger end. Using a pair of pliers, bend a 1/4 tip 90 degrees to the end of each side. Then bend an offset (two bends required each side) into each end so that the tips can fit into the injector, while the two hanger wires can snug together just above the injector. Cinch the zip tie around the two wires, trim the excess.
Slide the zip tie up towards the hand grip (hanger) end while inserting the bent tips into each side of the injector. Slide the zip tie down to tighten the tips in place in the injector. Hold the puller with one hand near the injector, pull on the other end, should work fine. You can also bend one of the handles on a binder clip as shown, but the hanger is the easier solution.