With the basket out of the dishwasher, the plastic parts basically snap on and off... popped the broken parts off and the new parts on. The 2 wheel and mount assemblies were a little more complicated. The video on the website advises to disconnect the supply line and drain line... I didn't have to do this. I just pulled the dishwasher out of its cabinet a little over a foot and removed the 2 screws holding each assembly in place and removed them. The previous gaskets (2 PER ASSEMBLY) seemed to be in perfect condition and remained stuck to the inside wall of the dishwasher... so I left them in place and replaced the assemblies and then replaced and tightened the screws holding the assemblies in place. I then carefully slid the dishwasher back to its original position and replaced the 2 screws into the underside of the counter. Then replaced the top rack... DONE!
This repair was pretty easy. In terms of the "challenging" rating, I gave it a 2 mainly because the repair wasn't totally brainless and required a little common sense.