PVT PLT OF A C172 INADVERTENTLY CROSSED ACTIVE RWY DURING TAXI TO PARKING. HE HAD REQUESTED PROGRESSIVE TAXI INSTRUCTIONS SINCE HE WAS UNFAMILIAR WITH THE ARPT.

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I LANDED AT SBA ABOUT XA30 ON NOV/XA/98 ON RWY 15L. I THEN CONTACTED GND CTL AND EXPLAINED 'UNFAMILIAR' AND REQUESTED 'PROGRESSIVE TAXI' TO FBO. ATC DIRECTED ME VIA TXWY B TO PROCEED AND HOLD SHORT OF RWY 25. AFTER HOLDING SHORT AT RWY 25; I WAS THEN GIVEN RAPID-FIRE INSTRUCTIONS TO PROCEED ON 3 DIFFERENT TXWYS TO FBO. I ASSUMED THAT THE CTLR WAS VERY BUSY AND THAT'S WHY HE SHOT ALL THE DIRECTIONS TO ME AT ONCE INSTEAD OF MAKING MY TURNS 'PROGRESSIVE.' I EVEN ASKED HIM TO REPEAT THE INSTRUCTIONS A SECOND TIME SO I COULD TRY TO WRITE THEM DOWN. BEING A LOW TIME PLT; I GOT CONFUSED AND INSTRUCTIONS WERE COMING AT ME VERY FAST. I ATTEMPTED TO WRITE THEM ALL DOWN BUT APPARENTLY WROTE THE FIRST TURN INCORRECTLY. I WAS DIRECTED TO TURN R ONTO TXWY H; THEN L ONTO TXWY J; THEN STRAIGHT ACROSS TXWY NEAREST FBO. I WROTE DOWN 'L ONTO TXWY H.' THIS PUT ME WBOUND ON TXWY H AND IN MY INTENSITY LOOKING FOR TXWY J; I DID NOT NOTICE THAT I HAD CROSSED OVER RWY 15L WITHOUT CLRNC TO DO SO. THE CTLR NOTICED MY POS; TOLD ME TO 'STOP' AND DO A 180 DEG TURN AND PROCEED TO CROSS BACK OVER RWY 15L. AT THIS TIME HE BEGAN GIVING ME PROGRESSIVE DIRECTIONS. I APOLOGIZED FOR MY ERROR AND PROCEEDED AS HE GUIDED ME TO THE FBO. THERE WERE NO FURTHER INCIDENTS OR CONVERSATION WITH ATC REGARDING MY ERROR. I REALIZE THAT I ERRED; AND THAT IT'S MY SOLE RESPONSIBILITY TO FULLY UNDERSTAND (AND VERIFY) INSTRUCTIONS GIVEN TO ME. AND THAT IF I DO NOT FULLY UNDERSTAND THAT I AM RESPONSIBLE TO QUESTION THE CTLR UNTIL I CLRLY UNDERSTAND WHAT HE HAS TOLD ME. I ALSO REALIZE THE SEVERITY OF THE POTENTIAL HAZARD THAT I CREATED BY XING AN ACTIVE RWY WITHOUT CLRNC.