My daughters and I have done quite a few "pull the engine" projects on Subarus, a few for clutches, I recommend pulling the motor. gives you nice easy access to do the rear main seal and the "leaky" cover while your there. It's a relaxed weekend of twiddling a few wrenches.
hmm... some tips as they pop into my head:
remove the hood for more enjoyable access
remove the rad and fans as a unit
leave the AC rad in, but put a piece of cardboard or thin wood next to it so you don't wiggle the engine into it.
ac compressor and ps can remain with the car and hooked up
good time to do the timing belt or plugs if your so inclined (more so on a dohc)
dont forget the rear o2 sensor wire, BEFORE you drop the exhaust
rinse the dirt off/out of, the outside of the rad while its out
I use Cetus in Calgary to resurface my flywheels not sure about edmt.
Never had a problem with OEM or Excedy clutches.
have fun.