Slide underneath the car and remove the little cover on the front of the trannie where the cable comes into it. See if it's an adjustable cable - check at the clutch fork end, where, hopefully, you would finda length of threaded cable and a couple of nuts. Loosen these nuts, and adjust so there is very little or no slack. The rest you can do from the firewall adjuster.
Also, we added a $20 Maximum Motorsport clutch pedal adjuster to move the pedal, then did the above descibed procedure to tune, then fine tune the engagement point. (The issue we had was the engagement point was out near the end of the clutch pedal travel and the travel was way too long - kness were hitting the steering wheel!)
It takes some patience and screwing around to get it right...and you'll still have to pedodically tune with the firewall adjuster (as cables do stretch and clutches do wear). But in the end, you'll be an expert with this...at least, at this point, I feel like I am. Heck, so is my wife. She knows where she likes the clutch and how to adjust to get it where she wants. (What a turn on!) LOL