It is easy, but be careful when pulling off the connectors - that plastic gets very brittle due to the heat. You can insert a small screwdriver into the little tab to "unclick" the connector from the coilpack, but be very gentle - just listen and feel for the click to know that you can pull off the connector. If you do break a tab, don't sweat it - you can still plug the connector back into the new coilpack - use a metal zip tie or something to harness the pack to the connector if you're worried about it coming loose.
Also, don't wiggle the connector and wire harness around - when you disconnect the connector, move the harness as little as possible. Just back the connector off of the pack enough to get the connector out. Again, the heat can make the wire harness brittle.
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