A CE210 TAXIES FOR TKOF AT LAS; NV; ONLY TO BECOME LOST AMONG THE TXWY AND RWY. PLT HAS A RWY INCURSION; DURING THE TIME AN ACR LANDS OVER THE TOP OF HIM.

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MY ACFT CESSNA P210 WAS PARKED AT FBO SIDE OF THE FIELD. AFTER RECEIVING CLRNC FOR AN IFR FLT TO SNA I CALLED GND FOR TAXI INSTRUCTIONS. THE WIND HAD NECESSITATED USING RWY 1R WHICH IS NOT THE NORMAL DIRECTION AT LAS. ALSO THERE IS MAJOR TXWY CONSTRUCTION. I WAS UNFAMILIAR WITH THE TAXI AND TKOF PROC FOR THIS RWY. WHEN I CONTACTED GND HE ASKED IF I COULD ACCEPT AN INTXN DEP AT TXWY B. I SAID I COULD BUT I WAS UNSURE OF WHERE TXWY B WAS AND 'I WOULD NEED SOME HELP.' HE REPLIED WITH 'TAXI TO RWY 1R AT INTXN B VIA TXWY H.' ALMOST IMMEDIATELY; HE THEN SAID HOLD SHORT OF TXWY H FOR TFC THEN TAXI ON TXWY H FULL LENGTH; CROSS RWY 25R TO RWY 1R. I TURNED R FROM FBO AND PROCEEDED S BUT I WAS NOT SURE I WAS ON TXWY H; I COULD SEE TXWY SIGNS BUT THEY WERE SOME DISTANCE AWAY ACROSS SOME CONSTRUCTION. I THOUGHT I WAS ON THE APRON AND LOOKED FOR A RAMP TO MY L TO THE TXWY. IT WAS VERY DARK AND THERE WERE FEW SIGNS. I PASSED AT SEVERAL BLOCKED RAMPS AND THEN TURNED L AT A POINT THAT MUST HAVE BEEN RWY 1L. I STOPPED BEHIND THE HOLD SHORT LINE KNOWING I WAS CONFUSED AND CALLED GND AND ASKED IF HE COULD SEE ME ON THE FIELD. HE REPLIED THAT HE COULD AND I NEED TO DO A 180 DEG AND RETURN TO TXWY H AND PROCEED S. I TURNED AROUND AND PROCEEDED S ON WHAT I WAS NOT SURE WAS TXWY H BECAUSE I COULD NOT FIND ANY SIGNS AT THIS POINT AND I WAS MORE CONFUSED. I CALLED ONCE MORE AND GND REPLIED TO PROCEED S AND MAY HAVE AGAIN SAID CROSS RWY 25R TO RWY 1R. I WENT FURTHER S THEN TAXIED ON TO WHAT I THINK WAS RWY 25R; BUT I COULD SEE NO SIGNS AND SOMEHOW I TURNED L AND CONTINUED TO TAXI. I THEN SAW A RWY TO MY R AND MY PAX (WIFE) SAID IT LOOKS LIKE WE ARE ON THE RWY. AT THAT MOMENT A PAX JET CROSSED DIRECTLY OVER US AT APPROX 50 FT LNDG ON RWY 1R. THE JET CALL SIGN WAS ACR; I THINK IT IS ACR; I THINK I HAD INADVERTENTLY TAXIED TO THE INTXN OF RWYS 1R AND 25R INSTEAD OF XING RWY 25R. I CALLED GND AND PROCEEDED TO CROSS THE RWY; GND REPLIED TO PROCEED TO THE NEXT TXWY AND FOLLOW IT AROUND ALMOST 45 DEGS TO A 'KIND OF' RUN-UP AREA AND HOLD SHORT OF RWY 1R. (I THINK I WAS NOW ON TXWY A) I REPLIED TO GND THAT I 'HAD IT NOW' AND I WOULD DO A RUN-UP. HE THEN SAID I NEEDED TO COPY A PHONE NUMBER TO CALL ON MY ARR FOR A POSSIBLE PLTDEV. I SAID I WAS READY TO COPY BUT I DID NOT UNDERSTAND THE INSTRUCTION. HE SAID I WAS ON THE RWY WITHOUT CLRNC. I DID A RUN-UP AND CALLED THE TWR FOR TKOF TELLING HIM I WAS HOLDING SHORT AT TXWY Z FOR RWY 1R. I HELD FOR ABOUT 10 MINS AND THEN WAS CLRED FOR TKOF. I KNOW ALL THESE DETAILS NOW BECAUSE I HAVE STUDIED THE INCIDENT THOROUGHLY TRYING TO UNDERSTAND HOW I GOT IN SUCH A DANGEROUS POS. I KNOW I SHOULD HAVE ASKED FOR 'PROGRESSIVE' TAXI INSTRUCTIONS; AND WHEN I WAS NOT SURE I WAS ON TXWY H I SHOULD HAVE STOPPED UNTIL I WAS SURE. I DID NOT SEE ANY RWY SIGNS WHEN I TURNED DOWN THE RWY; I DID NOT SEE ANY TXWY LINES OR LIGHTS ACROSS RWY 25R. FOR THE FEW SECONDS IT TOOK TO GET OUT ON THE RWY I WAS TOTALLY CONFUSED. I CROSSED THE HOLD SHORT LINES BECAUSE I HAD CLRNC TO CROSS RWY 25R BUT WHY I TURNED ONTO THE RWY I DON'T KNOW. WHEN I ARRIVED AT SNA I CALLED THE LAS TWR AND TALKED TO THE SUPVR. HE WAS VERY COURTEOUS AND SAID HE NEEDED SOME INFO BECAUSE THE SIT WOULD HAVE TO BE INVESTIGATED SINCE IT INVOLVED ANOTHER ACFT AND I DID NOT HAVE CLRNC TO BE ON THE RWY. HE SAID HE WAS NEW AT THIS BUT I WOULD PROBABLY HEAR FROM SOMEONE ON OCT/TUE/97. HE TOOK MY NAME; ADDRESS; PHONE NUMBER; PLT LICENSE NUMBER.