Product review (5 stars): P-Trap install is easy- Remove drain blocking ice first
Easy install with good directions, the install of the p-trap tube took about 15 minutes, and removing the drain ice blockage in the freezer took about an hour.  Use some saliva to "lube" the spacer insert and the upper portion of the p-trap tube.  You do need to defrost the unit.  Watch a couple of YouTube videos on how to defrost the freezer, removing and reinstalling the upper shelf.  I used hot tap water and a baster to melt the ice, an some old towels to capture the mess.  It was time to clean out the freezer anyway.