I'm skipping the week's play-by-play of this little swap. The biggest obstacle ended up being getting the transaxle back in the car; if you're stuck doing this, try lowering the engine a bit, mating up the transaxle, and raising it back up until the upper transaxle mount lines up the way you want it, then bolt the sucker down. Also, I'd suggest having a clear plan for organizing all the bolts you pull from the car as you do this; you don't want to try and remember which bolt went where when you start putting it all back together.
Final result: ACT 2600 and Fidanza flywheel installed. I now have about 200 break-in miles on the clutch, and after a few pedal adjustments, I'm finally getting the hang of driving it. This is a dramatic change over stock; the engine revs (and decellerates) much faster thanks to the aluminum flywheel, and the clutch has a much stiffer feel to it. I haven't noticed any of the slipping that originally prompted me to do the clutch upgrade, with the added bonus of this clutch grabbing a lot harder than the old one; I'd definitely consider this upgrade a success.