A B737-800 CREW; TURNING FINAL AT CVG; OVERSHOT FINAL; ENDED UP HIGH; EXECUTED A GAR.

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BEING VECTORED FOR APCH TO RWY 18R AT CVG. LOW TIME FO FLYING. ATC HAD US KEEP OUR SPD UP SINCE WE WERE #1 FOR RWY 18R. 20 MI SE OF FIELD; WE WERE TOLD TO EXPECT RWY 18L. ABEAM FIELD; HDG N ON DOWNWIND; SWITCHED BACK TO RWY 18R. ATC DIRECTED BASE TURN APPROX 6 NM NW OF FIELD. ATC ASKED IF WE HAD FIELD IN SIGHT. THE FO WAS UNSURE; BUT CAPT HAD ARPT AND ACCEPTED VISUAL AFTER ATC DIRECTED 150 DEG HDG FOR DOGLEG OUTSIDE OF LOGOZ. CAPT DIRECTED FO TO INTERCEPT LOC AND GS. FO ARMED APCH; VERIFIED ON FMA. ATC CALLED OUT TFC TURNING FINAL TO RWY 18L. CAPT LOOKED E FOR TFC; FO WAS STILL TRYING TO VISUALLY ACQUIRE RWY 18R. CAPT LOOKED BACK AND OBSERVED ACFT HAD OVERSHOT RWY 18R FINAL. CAPT DIRECTED FO TO DISCONNECT AUTOPLT AND HAND FLY BACK TO FINAL. AS FO CORRECTED BACK; TCASII RA OCCURRED. OUR ACFT WAS AT 2500 FT MSL BUT DUE TO TAILWIND (300 DEGS AT 11 KTS) AT FIELD LEVEL; ACFT WAS TOO HIGH FOR SAFE APCH; APPROX 3 1/2 NM FROM RWY 18R. CAPT DIRECTED FO TO GO AROUND AT 2500 FT MSL AND REQUESTED A TURN TO THE W FROM ATC TO RE-ENTER DOWNWIND. SUBSEQUENT APCH AND LNDG WERE UNEVENTFUL. FO'S UNFAMILIARITY WITH ARPT AND TRYING TO VISUALLY ACQUIRE RWY 18R; COMBINED WITH TAILWIND ON DOGLEG DISTRACTED FO FROM NOTICING OVERSHOOT. AUTOPLT WAS UNABLE TO PREVENT OVERSHOOT WHEN INTERCEPTING LOC DUE TO TAILWIND ON DOGLEG TO FINAL. CAPT DISTR BY TFC ON RWY 18L AND MULTIPLE RWY CHANGES NECESSITATING NEW BRIEFS AND COCKPIT SET-UPS. CAPT EXPECTED FO TO INTERCEPT LOC AND GS AND LOGOZ THEN ACQUIRE RWY; BUT FO RELIED ON AUTOPLT TO INTERCEPT WHILE HE LOOKED FOR RWY. AIR CREWS TEND TO ACCEPT VISUALS TO EASE CONGESTION WHEN ARPT NOT RWY IN SIGHT. IN METROPOLITAN AREAS SURROUNDING LIGHTS AND RWY LIGHTS ON LOW SETTINGS CAN MAKE RWY IDENT DIFFICULT. END OF A PLANNED 12 HR DUTY DAY AND 7 HR 52 MIN BLOCK DAY. CHANGE ACTIVE RWY WHEN TAILWIND EXISTS.