Break pedal to the floor and fluid leak

[spanos70]

Was stopped at a red light with car in neutral. stepped on the clutch to shift to first, heard and felt a slight pop in the clutch pedal. The pedal now remains on the floor and hydraulic fluid was leaking from under the car. was unable to get the car into gear while running, so I turned off the engine, shifted to first and got the car off the road... Then flat-bedded to mechanic. Could this be the master/slave cylinder or possibly a leak elsewhere?

Is there a DIY procedure to replace master/slave cylinder?

Thanks.........

2001 boxster 56k