Two of us just took a tranny out of a '91 SE-R and fixed the disc (was put in backwards - not by me
) and put it back in within 2 hours. this was Thrusday.
Took another hour or so to get all the bolts torqued down, all the intake back on, and then we replaced the plugs, wires, cap & rotor and fuel filter.
It's not that hard.