Frank,
Usually most of these door seals are intended to be replaced by double jointed two man teams and there is a “knack” to doing them that defies explanation to be honest. Plus they’re all different just to make it even more fun, some of them take us a lot of time to get right on and it’s only through experience that you learn the best way for each appliance.
All I can advise is to keep trying and have the plasters to hand for the little cuts you may recieve. 😉
K.