A PA32 PVT PLT WITH HIS CFI TAXI OVER THE HOLD LINE AFTER THEIR ENG RUN UP PRIOR TO CALLING THE TWR AT JXN; MI.

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I WAS INVOLVED IN A TRAINING/PLEASURE FLT AS BOTH A PAX; BUT ALSO AS A CFI. AFTER HAVING LUNCH AT THE TERMINAL; THE OWNER OF THE ACFT AND I BOARDED HIS CHEROKEE 6 FOR OUR RETURN FLT TO ZEELAND; MI (Z98). AFTER RECEIVING OUR IFR CLRNC AND TAXI CLRNC; WE TAXIED TO RWY 24; WHICH WAS OUR TAXI CLRNC. AFTER HAVING COMPLETED A RUN-UP AND ORGANIZING FLT MATERIALS AND CHARTS; WE BEGAN TO TAXI UP THE RWY 24 HOLD SHORT LINE. AS WE APCHED THE LINE; I LOOKED OUT TOWARDS THE RWY 24 APCH PATH. THE PATH WAS CLR. A FEW SECONDS LATER; IT OCCURRED TO ME THAT WE WERE STILL IN MOTION AND HAD CROSSED THE HOLD SHORT LINE. I IMMEDIATELY APPLIED BRAKES TO KEEP THE AIRPLANE FROM MOVING AND FURTHER ANY TAXIING ONTO THE ACTUAL RWY SURFACE. FORTUNATELY; THERE WERE NO ACFT EITHER ON THE RWY ITSELF OR ON FINAL APCH; SO THERE WAS NEVER A CONFLICT OF ANY KIND. I BELIEVE THE PROB AROSE FROM A COMBINATION OF THINGS. FIRST; I WAS RELAXED AND NOT AS VIGILANT ABOUT OUR SITUATIONAL AND POSITIONAL AWARENESS AS I SHOULD HAVE BEEN. SECOND; THE PLT I WAS FLYING WITH WAS SOMEWHAT INEXPERIENCED WITH THE ATC ENVIRONMENT. HAD I BEEN NOT 'STARING' OUT TOWARDS FINAL APCH I WOULD HAVE PREVENTED OUR RWY ENVIRONMENT TRANSGRESSION. I FEEL THAT THE BEST CORRECTIVE ACTION OUTSIDE OF CONFESSING AND COMPLYING WITH ATC IS TO BE EVEN MORE ALERT AND SITUATIONALLY AWARE AS ONE IS APCHING ANY HOLD SHORT LINE DURING TAXI. I ALSO HAVE BEEN USING A LINE UP CHKLIST THAT REQUIRES A CHK OF WHETHER A CLRNC HAS BEEN OBTAINED (IF NECESSARY) BEFORE TAKING ANY RWY FOR DEP. ALONG WITH THAT ITEM; THERE ARE OTHER ITEMS ON THE LINE UP CHKLIST THAT CONTRIBUTE TO SITUATIONAL AWARENESS AND FLT PREPAREDNESS.