Clutch questions. - Not a "which clutch?" thread.

[Hurtenstein]

Ok, my current clutch shudders like i do when i see a fat chick in a mini skirt. Absolutely un-launchable. And its slipped twice on me during a hard booting.
So its time to go. Plus i've got a lightweight flywheel i want to bung in.

So here are the questions:
What determines the heaviness of the pedal? My current one is heavier than a post steak house poo, and i love it. It stops people who normally might like to take it for a spin from doing so.

Also, how hard is it to change yourself? Im pretty mechanical minded and i've got tools. Is it a two person job? And is there a guide anywhere?

And finally, the Exedy Organic is definately the recommended choice for a 5 speed?