Bit fiddly, NO, YES, YES!!
Bit fiddly as it is a bit shrouded by the front cover , it has a stop inside so can't go wrong really.
Just use a VITON seal when you do it, NOT a ford seal as they are useless.
If you go to a seal supplier tell them it is 42 - 56 - 7, this is the dimension of the seal, also the same as jackshaft.
tabetha