A C182 PVT PLT CROSSES THE HOLD SHORT LINE WHILE AWAITING A FREQ CHANGE AND TKOF CLRNC AT SUN; ID.

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I RETURNED TO OUR C182 AT HAILEY ARPT FOR THE RETURN TRIP TO BOISE. FACING AWAY FROM THE RWY; THE PLANE WAS PARKED 40 YARDS FROM THE RWY AND ABOUT 20 YARDS FROM THE HWY RUNNING PARALLEL TO THE RWY. MY PARKING PLACE WAS SELECTED EARLIER BY LCL PERSONNEL WHEN I LANDED AND TAXIED TO THE AREA DIRECTED BY GND. I PREFLTED; DID A RUN-UP; AND WHEELED THE PLANE 180 DEGS IN POS. MY HUSBAND (A STUDENT PLT WITH ABOUT 60 HRS) THEN CALLED HAILEY GND WHILE I LISTENED. HAILEY GND ADVISED ME TO TAXI ACROSS THE RWY FOR RUN-UP. WHILE I TAXIED DOWN TOWARDS THE R END OF THE RWY AND PAST THE JETS; MY HUSBAND ADVISED HAILEY GND THAT I HAD ALREADY DONE A RUN-UP AND WAS READY FOR TKOF. ON TURNING TOWARDS THE RWY; I STOPPED SHORT OF THE RWY TO LOOK BOTH WAYS AND AWAIT HAILEY GND. WHILE STOPPED.; HAILEY GND ANSWERED BACK TO CONTACT HAILEY TWR; WHICH I DID WHILE STILL STOPPED SHORT OF THE RWY. HAILEY TWR INDICATED THAT I HAD DONE AN INCURSION TOWARDS THE RWY. MY HUSBAND THEN ADVISED HAILEY TWR THAT I WAS FOLLOWING INSTRUCTIONS AS WE UNDERSTOOD THEM FROM HAILEY GND; THAT WE THOUGHT HAILEY GND ASKED US TO CROSS THE RWY FOR RUN-UP. I EXPLAINED I STOPPED SHORT OF THE RWY FOR PERMISSION TO TAKE OFF SINCE I HAD ALREADY DONE MY RUN-UP. I ALSO EXPLAINED I MAY HAVE MISUNDERSTOOD HAILEY GND. HAILEY TWR THEN GAVE ME PERMISSION TO TAKE OFF. I LEARNED FROM THIS INCIDENT THAT I SHOULD NOT LEAVE THE TXWY TO APCH THE RWY WITHOUT RECONFIRMING WITH GND MY POS AND INTENT BEFORE MAKING AN INCURSION OFF THE TXWY AND INTO THE RWY AREA. I AM NOT FAMILIAR WITH THE HAILEY ARPT AND DO NOT RECALL IF I CROSSED A SOLID YELLOW LINE WITH STRIPES ON THE FAR SIDE. I DID NOT HAVE A LAYOUT OF THE HAILEY ARPT AND TXWY WITH LABELS. I MAY HAVE MISUNDERSTOOD OR MISHEARD WHAT HAILEY GND ASKED ME TO CROSS FOR THE RUN-UP AND WILL BE SURE I AM CLR IN THE FUTURE BEFORE A POSSIBLE INCURSION.