Two allen wrenches: 5mm for the cap (three screws, one on the bottom and moderately hard to get at) and 3mm for the rotor. If I was to give one peice of advice it would be: be very careful not to strip out any of the cap screws, because if you do you are SOL. Good luck and if you have any specific ?'s just ask 'em.
-Matt-

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Currently:
1972 350SL Euro 4spd
1973 BMW R75/5
1981 BMW R80GS
1995 FZJ80 with OM606 Conversion In Progress