When pushing in the clutch, the pedal firmness is really soft. I'm used to hydraulic clutches, so i was wondering what could cause this in a cable clutch? Could it just be that the clutch is worn?

Or can it be adjusted via the cable?

 

It can be adjusted via the cable. the adjustment is almost at the end of the cable at the release fork for the throwout bearing. You can adjust the grab point of the clutch. Be careful not to tighten too much or you will be engaging the pressure plate causing slipping and premature wear.

 

is it a stock clutch and pressure plate?

 

yes, all stock

what tools, if any, would i need to use to adjust it?

 

no tools necessary.

 

Keep in mind that no matter how much you adjust it, it wont get any stiffer.
Cable trannies are known for the soft peddle.
There should be a small bit of play in the arm. I believe around 1/8" or around there. Check a manual for the play.