if you take your time and read the haynes its a nice easy job, with practice i changed my flywheel for a lightened one and fitted a brand new clutch in about 2 hours,
you dont even need to take the gearbox out of the engine bay.
the answer is yes the clutch does slip a bit if you give it the beans, the car has been stood a while, i may try and change the cable before i change the clutch eliminate that first
my first clutch kit cost me £35 and the only tool you need to fit it is a 12mm spanner a 14mm spaner and a good eye, or a piece of metal bar thet just fits down the splines in the clutch (made this myself out of some bar i had lying around)