The slave cylinder is inside the bell-housing of the transmission.
You'll want to remove the starter, the shift linkage, the axles (12-point bit), the slave cylinder hydraulic line (top of the trans in front of the linkage) & the motor mount. Your biggest issue will be actually getting the trans out, as the subframe will be in the way.
When I replaced mine, I loosened the subframe bolts (which should be replaced if you go this route), and the trans slid right out.
It's a good idea to replace the slave cylinder while you're in there, as they tend to develop leaks. Be sure to prime the new one with brake fluid BEFORE you install it, as this will help with bleeding it later (there's a DIY for that in the FAQ).
One thing to remember is this: DO NOT step on the clutch pedal while the slave is disconnected. This will ruin the seals on your master cylinder, which will need to be replaced in order to properly bleed the entire system (as me how I know).
Hope that helps
Edit: Here's a link for a 12v VR6 trans replacement. It's similar in most respects & has some helpful tips on removing connectors & such. The biggest differences are the slave cylinder, the physical size of the trans & some bolt locations (specifically the motor mounts).
Or this, 5 posts down...