Honestly, once you get the fan out the first time, then the rest is pretty easy.
You don't absolutely need to replace everything.
Just spring for the pump and put in a new thermostat and replace the other crap when you feel like it.
The pump will fail before 75k miles.
The pump failure is surprising reliable, its happened to me twice between 62 and 72 on different cars.
I am trying to decide what fan to go with on the S54 at the moment.
I figure the fan is a big part of why the pump fails.
2001 Alpine / Schwartz Coupe
2001 Estoril / Estoril Coupe
2001 Steel Grey / Estoril Coupe
1999 Estoril / Estoril Coupe
Sunroofs are for girls.