Product review (5 stars): Installation Instructions
This is an OEM/factory part.  Installation can be done in as few as 20 minutes, plan on an hour beginning to end if you are unfamiliar with the washer.  Instructions are provided (see photos).  Kit comes with two mounting options, depending on your washer/model.  Switching from one mounting to the other is simple (e.g. 1 minute).

To remove/install, you will need the following: Torx T-20 bit and driver, standard/slotted bit screwdriver and/or 5/16 socket (to remove pipe clamp), spring clamp pliers or equivalent (e.g. channel-lock), towel.

As mentioned, full instructions are provided.  R&R is simple and straightforward and can be done with washer in place.  Note: There will be water in the bottom of the wash drum and discharge pipe.  If you have a wet-dry vac, start to unscrew the drain pump filter cap but do not remove.  Use the wet-dry vac to suck up the water as it seeps around the filter cap.  Slowly unscrew cap until all water has been vacuumed up.  Remainder of procedure is documented in instructions.  On completion, write the 'installed date' on the pump so that you can reference in the future, if needed.

Also, these washers have a 'diagnostic' mode that you can use to check proper operation and for leaks.  The sequence will be different depending on the washer model, search around and you should be able to find.