I'd say its about 3 to 4 hours work, at a comfortable pace, easily knock an hour plus off if you have the use of a ramp... also double check that the clutch supplied is the correct one, and is a good quality brand! Hopefully its a LUK/Sachs item, that is the same as OE
Surface rust will be fine cleaned off with brake cleaner, excessive rust may be a problem, post up a pic, if you're not sure
I'd also swap out the old cable, just as a matter of course...
Thom