Don't do what I did and remove the default extruder in a hurry. Notice how the standard extruder separates from your Ender 3, then follow the installation steps for that extruder in reverse order, referring to the photos in the item listing, and you should be fine. I installed it straight away and have no baseline between this and the standard extruder, but I can say I've had no problems with the extruder or the feeder in combination with the Capricorn tube and parts (springs) it seems of good quality even if the supplied manual is quite useless. Worst case YouTube videos on how to install one of these. I think CEP did well.
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