CONCENTRATING ON MAINTAINING VISUAL SPACING FROM A LNDG B737 AT LBB; C414 PLT FORGETS TO CHANGE WHEN DIRECTED TO TWR FREQ FOR LNDG CLRNC.

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I WAS PIC OF A CESSNA 414 ENRTE TO LUBBOCK FROM BROWNWOOD; TX. I WAS CLRED INTO CLASS C AIRSPACE AND GIVEN A SQUAWK CODE AND TOLD TO EXPECT RWY 17R. SHORTLY AFTER; THE APCH CTLR DIRECTED ME TO DISCONTINUE MY DSCNT TO ALLOW A B737 TO COME UNDER MY PLANE AND ON TOWARDS THE ARPT. THE B737 ASKED THE CTLR IF RWY 26 WAS AVAILABLE AND WAS TOLD THAT IT WAS NOT; AND TO EXPECT RWY 17R. SHORTLY AFTER; THE CTLR ASKED IF I HAD A VISUAL ON THE B737 TFC AND I RESPONDED AFFIRMATIVE. AT THAT POINT; THE CTLR INSTRUCTED ME TO CONTACT TWR. THE PROB THAT RESULTED WAS MY VISUAL ON THE B737 LED ME TO BELIEVE THAT THEY WERE STILL ON A L BASE FOR RWY 17R AND THAT THEY WOULD BE INTERCEPTING ME PRIOR TO MY TURNING FINAL. I KEPT A VIGILANT WATCH ON THE B737 TO MAKE SURE THAT I WAS NOT GOING TO OBSTRUCT THEIR ENTRY ONTO THE FINAL APCH PATH. AFTER A FEW MOMENTS; I COULD SEE VISUALLY THAT THE B737 WAS NOT GOING TOWARDS RWY 17R; RATHER A STRAIGHT-IN FINAL FOR RWY 26. HAVING DISTINCTLY HEARD THE CTLR REFUSE THE INITIAL REQUEST FOR RWY 26; I BECAME EXTREMELY VIGILANT UNTIL I SAW THE B737 ON SHORT FINAL TO RWY 26. I THEN TURNED TO A 5 MI L BASE FOR RWY 17R; TURNED FINAL; LANDED RWY 17R AND CONTACTED GND WHEN OFF THE RWY. IT WAS THEN THAT I REALIZED I HAD NEVER CONTACTED THE TWR AND HAD NOT RECEIVED LNDG CLRNC. I WAS ASKED TO CONTACT THE TWR; WHICH I DID; AND RELAYED THIS INFO. MANY TIMES; I FLY INTO LUBBOCK IN THE EVENING AND AS OFTEN AS NOT; I LAND WITH APCH CTL AND EVEN TAXI WITH APCH SINCE THERE IS LITTLE TFC. MY CONFUSION RESULTED FROM THE CONFUSING APCH INSTRUCTIONS FROM ATC TO THE INBOUND B737 AND MY EFFORTS TO INSURE THAT I DID NOT INTERFERE WITH THAT PLANE'S FINAL APCH. MY CONCENTRATION ON THAT SIT RESULTED IN MY FORGETTING TO CONTACT TWR AND GET LNDG CLRNC; WHICH MANY TIMES IS RECEIVED FROM APCH CTL. I AM VERY SURPRISED THAT THE TWR DID NOT MAKE A CALL TO APCH TO PROMPT ME TO MAKE THE FREQ CHANGE AS IT WAS SEVERAL MINS BTWN THE INSTRUCTIONS TO CHANGE TO TWR FREQ AND MY ACTUAL LNDG.