A B757-200 CREW RPTS MISSING LAX SEAVU 1 ALT RESTRS AFTER BEING DISTR WHILE ENTERING FMS ENTRIES FOR A LAST MIN RWY CHANGE.

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ON DSCNT INTO LAX; WE WERE SET UP AND BRIEFED FOR THE SEAVU 1 ARR TO RWY 25R. AFTER PASSING KONZL; APCH CHANGED OUR RWY TO RWY 24R. I WAS FLYING; AUTOPLT ON; AND STARTED TO CHANGE THE RWY AND ARR TO THE NEW RWY IN THE FMS. I FAILED TO SELECT THE ENTIRE ARR ALL THE WAY BACK TO TNP; WHICH DROPPED A LOT OF THE ARR POINTS OUT OF OUR RTE OF FLT. SO I WENT BACK INTO THE FMS TO RESET THE ARR. AS I WAS DOING THIS; THE ACFT NOW HAD NO RTE INFO TO FOLLOW; SO I SELECTED HDG SELECT TO KEEP THE ACFT GOING IN THE DESIRED DIRECTION AND SELECTED VERT SPD TO KEEP THE ACFT DSNDING. BY THE TIME I FINALLY GOT THE ARR IN THE FMS CORRECTLY; WE HAD PASSED SEAVU L OF COURSE AND AT APPROX 15200 FT. I THEN SET ABOUT GETTING US BACK ON COURSE AND GETTING US DSNDING THE WAY WE NEEDED TO BE. BY THE TIME WE WERE APCHING DECOR; WE WERE WAS HIGHER THAN THE 9800B9000A ALT RESTR; AND EVEN WITH FULL SPD BRAKES; PASSED DECOR AT APPROX 11000 FT MSL. WE TRIED TO CALL APCH FOR RELIEF ON THE RESTR BUT WERE UNABLE TO DUE TO FREQ CONGESTION. I CONTINUED THE ACCELERATED DSCNT UNTIL WE WERE BACK ON THE PRESCRIBED DSCNT PATH AND FLEW THE ARR AND APCH TO AN UNEVENTFUL LNDG ON RWY 24R AT LAX. IN HINDSIGHT; I SHOULD HAVE GIVEN THE ACFT TO THE CAPT PRIOR TO GETTING INTO THE FMS OR DEFINITELY AFTER HAVING MESSED UP THE INITIAL ARR ATTEMPT; SO THAT SOMEONE WOULD HAVE BEEN DEDICATED TO FLYING THE ACFT WHILE ALL THIS WAS GOING ON. I TRIED TO DO TOO MUCH; AND UNFORTUNATELY FOR US; NONE OF IT VERY SUCCESSFULLY. NOT MESSING UP THE INITIAL ATTEMPT WOULD HAVE BEEN A SMART MOVE AS WELL. SUPPLEMENTAL INFO FROM ACN 709426: WE JUST GOT BEHIND DURING A VERY BUSY TIME. IT WOULD HELP IF THE INITIAL APCH CTLR COULD GIVE A RWY ASSIGNMENT THAT WOULD STICK -- THERE IS MUCH MORE TIME TO RESPOND EARLY ON THIS ARR. I KNOW WE ARE TOLD TO DITCH THE FMS AND FLY RAW DATA WHEN THINGS CHANGE. 6 YRS AGO IN A B727 THAT WOULD HAVE BEEN EASY; BUT WHEN THINGS GET TOUGH YOU DO WHAT YOU KNOW. I HAVE NOT FLOWN AN ARR EVEN CLOSE TO THIS COMPLEX ON RAW DATA IN 5 YRS. THINGS THAT ARE EASY WHEN PRACTICED OFTEN; ARE A LITTLE SCARY WHEN UNDER A LOT OF PRESSURE AND UNFAMILIAR. WE TRIED TO NOTIFY APCH THAT WE WERE NOT GOING TO MAKE THE RESTR; BUT WE MUST HAVE BEEN BLOCKED BECAUSE THEY NEVER RESPONDED AND THE FREQ WAS VERY BUSY. THE REMAINDER OF THE ARR AND LNDG WERE NORMAL.