AN LJ-60 FLT CREW TAXIED ONTO ACTIVE RWY WITHOUT CLRNC AT ISP WITH ANOTHER ACFT ON FINAL; CAUSING A GAR.

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WE CALLED FOR TAXI AND WERE TOLD TO TAXI VIA TXWY W AND HOLD SHORT OF RWY 6. APCHING RWY 6; WE WERE THEN CLRED TO TAXI TO RWY 33L VIA RWY 10. I TOOK 1 MORE LOOK AT THE RWY DIAGRAM AND WE PROCEEDED ONTO RWY 6 FOR RWY 10. WE WERE ASKED TO EXPEDITE CLRING RWY 6 FOR ARRIVING TFC. TAXIING DOWN RWY 10; WE FINISHED UP THE TAXI AND BEFORE TKOF CHKLIST. AT SOME POINT TAXIING DOWN RWY 10; I GOT THE PERCEPTION THAT WE WERE CLRED INTO POS AND HOLD FOR RWY 33L. I CALLED FOR THE RWY LINE-UP CHKLIST AND TURNED ONTO RWY 33L. TWR THEN CALLED US TELLING US TO CLR THE RWY IMMEDIATELY AND THERE WAS LNDG TFC. I CLRED THE RWY TO THE E. AS I TRIED TO FIGURE OUT HOW I ENTERED AN ACTIVE RWY WITHOUT CLRNC; I FOUND SEVERAL THINGS THAT MIGHT HAVE CONTRIBUTED: 1) I WAS VERY TIRED. I HAD GOTTEN HOME AT XA30 THAT MORNING FROM A 3 DAY TRIP. THIS HAD SOME EFFECT ON MY ALERTNESS. MY NORMAL HABIT PATTERNS WERE DISRUPTED AND I FAILED TO VERBALLY CONFIRM WE WERE CLRED ON THE HOLD AND FAILED TO VISUALLY CHK FINAL. 2) I WAS FLYING WITH SOMEONE WHOM I HAD NEVER MET/FLOWN WITH BEFORE. HE WAS NOT FAMILIAR WITH THE LJ-60. THE SOP'S THAT I AM ACCUSTOMED TO USING WERE NOT COMMON BTWN US. 3) THE ACFT WE FLEW IN HAD NO HEADSETS; WHICH I USUALLY USE; SO WE USED THE HANDHELD MIKE WITH ACFT SPEAKERS INSTEAD. ALL OF THESE FACTORS SHOULD HAVE BEEN A HUGE ALERT CAUSING ME TO SLOW DOWN AND BE VERY DELIBERATE. I HAVE RECENTLY REACHED A POINT WHERE I AM VERY COMFORTABLE AND CONFIDENT FLYING THE LJ-60. THIS CONFIDENCE PROBABLY MASKED THE ABOVE WARNING SIGNS. REALIZING I WAS TIRED; I SHOULD HAVE SLOWED THINGS DOWN AND BEEN MORE METHODICAL AND CAUTIOUS IN MY ACTIONS. FLYING WITH SOMEONE FOR THE FIRST TIME; RATHER THAN CURTAILING THE CREW BRIEF; I SHOULD HAVE TAKEN THE TIME TO GET AN UNFAMILIAR COPLT UP TO SPD WITH THE LJ-60 AND MY EXPECTATIONS. I AM FORTUNATE THAT THIS INCIDENT DID NOT RESULT IN AN ACCIDENT. I REALIZE IN THIS PROFESSION; THERE IS ZERO TOLERANCE FOR ERROR. I ALSO REALIZE THAT BETTER CREW COORD AND COMS WOULD HAVE PREVENTED THIS INCIDENT. I AM FORTUNATE TO HAVE LEARNED A GREAT DEAL ABOUT RECOGNIZING MY OWN LIMITATIONS.