I have replaced a dozen or so over the years and other than never
having enough hands to hold the gasket, trim piece, screw and screw gun
at the same time, it's never been a problem.
Now I have a couple or three Whirlpool/Roper refrigerators in rentals
and when you peek under the door gasket, there is no hardware. The lip
of the gasket is behind the inner door liner and it appears that the
whole mess is glued to the door.
Are these things replaceable or do they expect you to just buy a new
refrigerator when they fail?