PLT OF LSA TAXIED ONTO RWY OF UNCONTROLLED ARPT WITH ACFT ON SHORT FINAL.

Narrative

I WAS DEMONSTRATING MY NEW ACFT TO AN INTERESTED PLT AT AN UNFAMILIAR ARPT. AS I DID MY MAGNETO CHK I WAS MONITORING THE CTAF AND WATCHING THE PATTERN AND I THOUGHT I WAS THE ONLY ACFT IN THE VICINITY. I HEARD ANOTHER ACFT ANNOUNCING FOR 'SPARTA TFC' BUT I FAILED TO REALIZE THAT NAME IS USED SYNONYMOUSLY FOR 'UPPER CUMBERLAND TFC' (THERE ARE SEVERAL ARPTS NEARBY USING THE SAME CTAF FREQ AS SRB). MY VISUAL SCAN OF THE APCH AREA WAS INADEQUATE (TOO QUICK). I ANNOUNCED MY INTENTIONS AND AS I CROSSED THE HOLD SHORT LINE I HEARD THE PLT OF THE MU2 ACFT ASK IF I WAS REALLY GOING TO PULL OUT IN FRONT OF HIM. I GLANCED L AND THEN SAW THE MU2 ON FINAL. I WAS ALREADY ON THE RWY SO ALL I COULD DO WAS PULL TOWARD THE R SIDE OF THE RWY; STOP; AND APOLOGIZE ON THE RADIO. THE OTHER ACFT EXECUTED A GAR AND PASSED ABOUT 200-500 FT ABOVE ME. I WAS PROBABLY SOMEWHAT DISTR BY TALKING TO MY PAX. I FAILED TO FOLLOW MY USUAL PRACTICE OF TURNING THE CT ALL THE WAY TOWARD THE APCH END OF THE RWY BEFORE XING THE THRESHOLD TO TAKE A GOOD LOOK FOR TFC. I RECENTLY CHANGED FROM A LOW-WING ACFT TO A HIGH-WING ACFT AND THE VISIBILITY IS CONSIDERABLY WORSE ON THE GND. I AM QUITE RELIGIOUS ABOUT FOLLOWING MY CHKLIST; BUT MY LIST DIDN'T ACTUALLY SPECIFY TURNING THE ACFT TOWARD APCHING TFC BEFORE TAXIING ONTO THE RWY. I WILL UPDATE MY CHKLIST TO HELP REMEMBER THIS INCIDENT.