Clutch release arm is breaking perhaps...? Either way transmission has to come out. What you describe is more likely release arm then clutch or pressure plate. Clutch likely has wear but don't usually just go out like that... you can always do the 5th gear test, but as I said, either way the transmission has to come out~
Get a clutch kit or if you can afford the down time have yours rebuilt, new release arm, good to go.
See this post:
http://986forum.com/forums/general-discussions/47568-squishy-clutch-pedal-after-hard-drive.html