Product review (4 stars): works so far
Just remove the front kick panel. Look for the screws that hold it in. You should find a manual in a plastic bag taped to it. It has the wiring diagrams in it that will help you to understand how all the electrical connections go together. This pump is right in front and is held in with two screws that screw in from the bottom, but you don't have to unscrew them to replace the entire unit.  Simple to install if you have any brains at all. Save the old unit as some of the old parts can be used if this new one cracks or something. It's mostly the pump part that stops working. You should unscrew the large cap on the main drain to remove objects that get into the drain. Lots of weird things get in there like change paper clips, even small cloth objects that will block the drain.
I hope this new part lasts a while as the front loading Kenmore washer it went in is a piece of crap and Sears charges ridiculous prices for parts.
Not only has this pump failed pump, but I have to constantly unplug and re-plug the cord to get the machine to power up. The washer doesn't get anything clean at all and I have been adding phosphates (TCP) to the wash to make up for those that have been removed from all the new detergents that get your clothes clean and DO NOT hurt the environment. Just more government interference and BS.
I'll never buy anything from Sears again. The company has gone to hell.