DC10-30 CREW HAD ALT OVERSHOOT FLYING THE LOC DME RWY 27 APCH AT SAN.

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WE HAD BEEN GIVEN VECTORS FOR THE LOC DME RWY 27. APCH TOLD US TO DSND FROM 5000 FT TO 4000 FT AND GAVE US A 240 DEG HDG TO INTERCEPT THE LOC DME RWY 27. I WAS THE PNF SO I SET AND ARMED 4000 FT IN OUR FMS AND SELECTED 240 DEGS ON OUR HDG. THE AUTOPLT WAS ON AT THE TIME AND THE LOC WAS ARMED FOR CAPTURE. THE CAPT BEGAN THE DSCNT AND WE INTERCEPTED THE LOC. I THEN LOOKED DOWN ON THE CTR PEDESTAL TO DOUBLECHK; WE HAD THE RIGHT COURSE AND FREQ IN THE ILS PANEL. WHILE I WAS LOOKING DOWN; APCH SAID TO STOP OUR DSCNT. I THEN LOOKED UP AND SAW THE CAPT HAD ALREADY STOPPED OUR DSCNT AT 3600 FT. I REPLIED 'ROGER.' THEN APCH INFORMED US THEY SHOWED US OUTSIDE OF VYDDA AND ASKED IF WE HAD THE ARPT IN SIGHT. WE REPLIED 'YES.' THEY THEN CLRED US FOR THE VISUAL APCH. WE WERE IN THE CLR AND SAW NO TERRAIN ISSUES AND WE LANDED UNEVENTFULLY. POSSIBLE CONTRIBUTING FACTORS: THE WHOLE FLC WAS NEW IN THEIR SEATS. THE CAPT HAD LESS THAN 100 HRS IN HIS SEAT. FO HAD JUST 100 HRS IN SEAT. FE APPROX 300+ HRS IN HIS SEAT. ALSO; IT WAS THE FIRST TIME THE CAPT AND MYSELF HAD BEEN TO SAN DIEGO. THE AUTOPLT FAILED TO CAPTURE THE SELECTED ALT.