CARJ LANDS WITHOUT CLRNC AT IAD.

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UPON ARRIVING THE IAD AREA; ATIS WAS CALLING FOR THE VISUAL APCH INTO RWY 1R. ME BING THE FLYING PLT; THE CAPT SET UP THE FMS FOR RWY 1R. ONCE WE GOT CLOSER; PTC APCH TOLD US TO EXPECT THE VISUAL FOR RWY 1L. I QUICKLY SWITCHED THE LOC FREQ FROM RWY 1R TO RWY 1L SO THAT I WOULD NOT CAPTURE THE WRONG LOC UPON BEING CLRED FOR THE APCH. ONCE PTC APCH CLRED US FOR THE APCH AND TOLD US TO CONTACT TWR; I MADE THE LOC FREQ ACTIVE AND COMMENCED THE APCH. THE CAPT FORGOT WE WERE CLRED FOR RWY 1L AND THOUGHT I HAD NOT INTERCEPTED THE LOC FOR RWY 1R; AND SPUN HEADING BUG APPROX 30 DEGS TO THE R TO CAPTURE A FALSE LOC. IMMEDIATELY; I QUESTIONED WHAT HE WAS DOING AND CLICKED OFF THE AUTOPLT TO HURRY UP AND ATTEMPT TO GET ESTABLISHED ON THE CORRECT LOC SO THAT I COULD GET THE ACFT IN A STABLE POSITION TO LAND. WELL; THROUGH THE COMMOTION; THE CAPT HAD SWITCHED FREQ TO CONTACT TWR BUT PUT THE WRONG FREQ IN. THE FREQ WAS QUIET BUT MY FOCUS WAS ON TRYING TO GET THE PLANE STABLE TO MAKE A SAFE LNDG. TO GIVE THE CAPT CREDIT; I WAS AND STILL AM FRESH OFF OF IOE AND THE CAPT FELT HE NEEDED TO TALK ME THROUGH CAPTURING THE LOC TO RWY 1L. IT WAS DURING THIS TIME FRAME WHERE WE COMPLETELY FORGOT TO CONTACT TWR. I HAD REALIZED THAT WE WERE NOT CLRED TO LAND RIGHT AS I HAD TRANSFERRED THE CTLS TO HIM SO THAT HE COULD TAXI US OFF THE RWY. ONCE WE WERE CLR OF THE RWY; IAD GND GAVE US A PHONE NUMBER TO CONTACT. THE CAPT CONTACTED THE TWR IN IAD; AND FROM THERE I KNOW NOT MUCH MORE. WHAT WILL BE DONE TO PREVENT A RECURRENCE OF MY SITUATION IS DISCUSS ANY CHANGES THAT APCH OR CTR MIGHT GIVE US WITH THE CAPT SO THAT WE BOTH ARE COMFORTABLE WITH THE CHANGE. I ALSO WILL DOUBLE VERIFY THAT I AM FROM NOW ON; 'CLRED' TO LAND BEFORE PUTTING THE ACFT ON THE GND. WHAT I SHOULD HAVE DONE WAS GONE AROUND AND QUESTIONED TWR ON WHETHER OR NOT WE WERE CLRED.