A COMMERCIAL RATED PLT FLYING A PA28 AT POU RPTS CONFUSING TAXI INSTRUCTIONS AND SUBSEQUENT RWY INCURSION.

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DEPARTING POU; HAD RECEIVED IFR CLRNC FROM GND; WRITTEN IT DOWN; READ BACK; AND VERIFIED BY GND. AT SAME TIME HELI ON SAME RAMP WAS HOVER TAXIING FOR DEP. QUITE A BIT OF NOISE AND COMMOTION. GND CLRED ME FOR TAXI: EXIT RAMP; L ON TXWY D; R ON 15; R ON TXWY B; INTXN 24 DEP. I REPEATED THIS BACK AND PROCEEDED TO TAXI. CAME TO TXWY A AND DID NOT SEE TXWY B SO CALLED GND BACK FOR DIRECTIONS. AFTER A LENGTHY PAUSE; GND SAID I HAD CROSSED RWY 24. AFTER A LENGTHY LECTURE FROM GND; I WAS ABLE TO TAXI TO INTXN 24 AND DEPART FOR AN OTHERWISE UNEVENTFUL TRIP. THERE WERE NO OTHER ACFT INVOLVED OR IN THE AREA. WRITING DOWN TAXI INSTRUCTIONS AS THEY ARE RECEIVED AND THEN READING BACK WHAT IS WRITTEN WOULD HAVE GIVEN AN ADDITIONAL VERIFICATION STEP IN THE CHAIN OF EVENTS. DID THE CTLR GIVE RIGHT INSTRUCTIONS? DID I HEAR THEM CORRECTLY? DID I REPEAT THEM BACK CORRECTLY? DID THE CTLR HEAR AND VERIFY MY READBACK? ALL OF THESE STEPS ARE USED FREQUENTLY FOR INFLT OPS. GND OPS COULD ALSO BENEFIT FROM THEIR USE. ALSO; THE LACK OF FULL PAGE ARPT DIAGRAMS IN THE APCH PLATES MEANS ONE HAS TO REALLY SQUINT AT THE TINY DIAGRAMS ON THE APCH PLATE PAGES TO GET THE BIG PICTURE ON THE TAXI INSTRUCTIONS. ADDITIONAL GND SIGNAGE INDICATING DIRECTIONS TO RWYS; ETC; WOULD ALSO BE HELPFUL. GND OPS REQUIRE EVERY BIT AS MUCH DILIGENCE; CAUTION; AND INFO AS AIRBORNE OPS.