I also did my clutch last December I think. It is time consuming, but if you have the tools and the time to do it, and are mechanically inclined, doing it yourself is a good way to save a chunk of money.
My dad and I have been changing out Honda transmissions for a while now, so I find doing the NSX tranny similar. Oddly , my dad prefers not to use a transmission jack. He feels lifting it by hand gives him more play to work with. It does take 2 bodies to make it work though. And the tranny is no where near 200lbs , maybe an auto is closer to that, but definitely not the manual trans. oh yes, we did this on the floor with jackstands.
Be prepared to change out your master and slave cylinders as well. I replaced the slave cylinder after the seal broke and fell apart. Works now, but my clutch pedal gets this "stuck" feel halfway through it's travel, like its catching on something briefly. I suspect my master cylinder is the perp, will replace soon, when i get the car back from the paint shop, getting my bumper replaced with an '02 bumper, going for the conversion.