A BE35 PLT FLEW AN INST APCH TO MONTEREY; MEXICO; WITHOUT APCH CHARTS.

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I FILED A VFR FLT PLAN FROM MMPR TO MMAN; AND TOOK OFF. CONDITIONS ENRTE WERE VFR UNTIL THE APCH INTO MMAN. MMAN WAS OVCST SO I ASKED FOR A LCL IFR TO MAKE THE APCH TO LAND. I WAS GIVEN APCH INSTRUCTIONS TO DSND TO 4000 FT AND FLY TO THE MONTEREY VOR TO EXECUTE THE VOR-A APCH. I DID NOT HAVE THE CHART FOR THE PUBLISHED APCH; BUT FOLLOWED THE CTLR'S INSTRUCTIONS AND FLEW TO THE VOR. I EITHER MISUNDERSTOOD; MISINTERPED; OR INCORRECTLY EXECUTED THE CTLR'S INSTRUCTIONS BECAUSE THE CTLR CAME BACK WITH FURTHER INSTRUCTIONS TO FLY THE VOR-B APCH FROM ANOTHER VOR. AT THIS TIME I WAS CONFUSED AND DISORIENTED; AND RESPONDED TO THE CTLR THAT I COULDN'T FIND THE VOR. THE CTLR CAME BACK; GAVE ME A DSCNT TO 3000 FT AND VECTORS TO THE FINAL APCH COURSE FOR LNDG ON RWY 22. ON FINAL APCH; I WAS GIVEN INSTRUCTIONS TO DSND BY THE PUBLISHED PROC; AND WAS TOLD I WAS W OF COURSE; ARPT 11 O'CLOCK POS; 3 MI. I DSNDED THROUGH THE LOWER LEVELS OF THE OVCST AND BROKEN CLOUDS; CORRECTED COURSE AND LANDED ON RWY 22. I GOT MYSELF INTO AN INST APCH CONDITION WITHOUT ANY PUBLISHED APCH PROCS AND HAD TO RELY ON THE APCH CTLR FOR VECTORS TO FINAL. THE FACTORS THAT I FEEL ARE CONTRIBUTING ARE AS FOLLOWS: 1) I DIDN'T PLAN TO GO AS FAR S AS PUERTO VALLARTA OR EXIT MEXICO AS FAR E AS BROWNSVILLE; BUT I WAS LULLED INTO A FALSE SENSE OF SECURITY BY A VACATION ATTITUDE; THE PREVIOUS DAYS OF GOOD WX; AND THE CONTINUOUS WARM; CLR CONDITIONS THAT EXISTED. 2) I DIDN'T HAVE INST APCH CHARTS FOR MONTEREY NORTE OR THE OTHER MONTEREY ARPTS. 3) I WAS EDUCATED BY INDUSTRY SOURCES INTO THE MIND SET THAT THE MEXICAN WX FORECASTING AND RPTING SYS WERE INADEQUATE OR NONEXISTENT; AND I DIDN'T PAY ENOUGH ATTN TO THE MONTEREY WX. 4) THE ACFT IS IFR GPS CERTIFIED; BUT I DID NOT HAVE THE MEXICAN DATABASE OR PROCS. MY PRIMARY MEANS OF NAV WAS USER WAYPOINTS FOR VORS AND ARPTS OF INTENDED LNDG; AND PILOTAGE USING WAC AND LOW ALT ENRTE CHARTS. 5) I AM A CURRENT INST PLT; ROUTINELY FLY IMC; AND AM PROFICIENT WITH INST PROCS. ALL OF MY FLYING IS IN THE UNITED STATES SYS. IN HINDSIGHT; MY WEAKEST TECHNIQUES ARE THE VOR APCHS BECAUSE IN THE UNITED STATES I PRIMARILY USE THE ILS AND GPS APCHS. 6) ALTHOUGH I LEARNED VOR TRACKING AND APCH PROCS; I HAVE FLOWN ONLY APCHS USING THE VISUAL DEPICTION OF THE GPS AND NOW REALIZE THAT I AM DEPENDENT ON THIS GPS FOR SPATIAL ORIENTATION. WITHOUT IT I COULD NOT PROPERLY EXECUTE THE INSTRUCTED VOR APCH.