I am by no means a plumbing expert - this was first ever time attempting. This was a straight forward replacement.
Watch the first part of this video (https://www.youtube.com/watch?v=LZY2kvSYQLY) to disconnect water and electrical lines. Safety first! Make sure you turn off the power before starting this process. Have a towel handy when you remove the hot water line. I ended up rubber banding plastic bags on the ends of the water lines so the water didn't get all over the floor.
Now all lines (water and electrical) removed you can get ready to pull out DW. You need to remove all mounting screws. You'll most likely have to remove 4. My unit did not have mounting screws on the top inside lips. Rather, there were light gray tabs on the inside left and right. Pop the tabs to reveal screws.
Pull out the DW. Put down a towel and roll DW on it's side. Underneath, remove two screws and pop two tabs to pull away the shield. Then you will see the part you need to replace. Unplug the wire plug then using an adjustable wrench remove part. Take the O-ring off the original part and put on the replacement part. Plug in the wiring then insert part and tighten (not too much!!) with the adjustable wrench.
Repeat the process in reverse order to re-install your DW. Safety first! Make sure you turn off the power before starting this process.