MD80 CREW HAD A RWY INCURSION BY CROSSING THE HOLD SHORT LINE OF RWY 12R AT MSP.

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LAST LEG OF 3 DAY TRIP. THIS WAS FIRST TRIP WITH NEW CALL SIGN AFTER 13 YEARS AND NEW DISP AND FLT PLAN PAPERWORK FORMAT. ON APCHING DEP END OF RWY 12R AT MSP SWITCHED TO TWR. ADVISE READY FOR DEP AS TAXIING TOWARD END OF TXWY. WHEN I RELEASED THE MIKE BUTTON; I WAS ABOUT 200 FT FROM HOLD SHORT LINE; I HAD PARTIALLY BLOCKED TWR AND HEARD; 'POS AND HOLD RWY 12R;' I RETRANSMISSION 'POS AND HOLD RWY 12R FOR OUR FLT.' THAT WAS ALSO BLOCKED PARTIALLY BY SOME ONE ELSE. THEN I RECONFIGURED POS AND HOLD AND WAS TOLD THAT IT WAS FOR ANOTHER ACFT AND WAS TOLD TO HOLD SHORT. I STOPPED THE ACFT. IT LOOKED LIKE I HAD JUST PASSED THE LINE BY 5 TO 10 FT. IT WAS NIGHT. I SAW NO OTHER ACFT. WE WERE THE #1 ACFT ON TXWY. I FINALLY SAW THE OTHER ACFT. HE WAS ON THE OTHER SIDE OF THE RWY AT AN INTXN WE HAD PASSED. NO LIGHTS THAT I COULD SEE. THERE WERE NO ACFT ON APCH. AFTER THE OTHER ACFT TKOF; I WAS CLRED ONTO THE RWY. THERE WAS NO MORE SAID. CONTRIBUTING FACTORS: LAST LEG OF A 3 DAY TRIP WITH TOTALLY NEW PROCS WE WERE LOOKING FWD TO GETTING THIS OVER WITH. THE TRIP WAS PROBABLY THE MOST STRESSFUL SINCE MY INITIAL CHECKOUT 13 YEARS AGO. NEW COMPANY; NEW PROCS WITH ONLY A 8 HR CLASSROOM INSTRUCTION ON PAPERWORK AND COMPUTER USAGE. THE REST OF THE TRAINING WAS BY PAPER BULLETIN COUPLE THIS WITH FATIGUE AND I AM SURE THIS WAS PART OF THE PROB.