FLT CREW OF CL65 FLEW OBSTACLE DEP PROC OUT OF EUG VICE EUG6 DEP ASSIGNED. OVERSHOT CLRED ALT WHILE ADAPTING TO THE REALIZATION AND CORRECTING THEIR FLT PATH.

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WE WERE ASSIGNED THE EUGENE 6 DEP. DUE TO A MISCOM IN THE COCKPIT; I; THE PF AND CAPT; FLEW THE OBSTACLE DEP PROC. WHEN CLRED FOR TKOF; NO HEADING ASSIGNMENT WAS GIVEN; SO I AUTOMATICALLY ASSUMED WE HAD NOT BEEN GIVEN A DEP PROC. OUR OPS SPECS REQUIRE US TO DO THE OBSTACLE DEP PROC WHERE AVAILABLE WHEN NO SID IS ASSIGNED. I BRIEFED THE OBSTACLE DEP PROC WITH THE FO JUST PRIOR TO TKOF. HE ACKNOWLEDGED THE OBSTACLE DEP PROC; AND WE DEPARTED. OUR FILED RTE WAS A STRAIGHT OUT CLB; BUT SINCE I THOUGHT WE HAD NOT BEEN GIVEN A DEP PROC WE THOUGHT WE WERE BOUND TO DO THE OBSTACLE DEP PROC WHICH IS A R TURN AT 1000 FT MSL TO EUG VOR. CROSS EUG VOR AT OR ABOVE 4000 FT BEFORE PROCEEDING ON COURSE. WHEN WE CHKED IN WITH CASCADE WE ONCE AGAIN REQUESTED THE VFR CLB. AT 1000 FT MSL I BEGAN THE R TURN TO GO BACK TO THE VOR. WE DEPARTED RWY 16. ROLLING THROUGH HEADING 260 DEGS CASCADE ASKED; 'WHAT ARE YOU DOING?' WE RESPONDED WE WERE DOING THE OBSTACLE DEP PROC. HE THEN ASKED; 'WHY WOULD YOU DO THAT? WERE YOU NOT ASSIGNED THE EUGENE 6 DEP PROC?' WE BEGAN SCRAMBLING FOR THE CLRNC AND THEN THE EUGENE 6 DEP PROC. I IMMEDIATELY BEGAN TO TURN BACK TO COURSE UPON REALIZATION OF OUR ERROR. WE HAD BEEN GIVEN AN ALT ASSIGNMENT OF 4000 FT. AT THIS TIME I BEGAN TO OVERSHOOT OUR ASSIGNED ALT. IMMEDIATELY I BEGAN CORRECTING. IN ALL THE CONFUSION AND QUESTIONING MY ATTN HAD BEEN DIVERTED FROM FLYING THE AIRPLANE. I HONESTLY DON'T KNOW HOW MUCH WE OVERSHOT; BUT I KNOW IT WAS A COUPLE HUNDRED FEET OF MORE. CASCADE THEN BEGAN ASKING OUR ALT. I BELIEVE WE STATED 4000 FT WHICH WE WERE AT WHEN ASKED. CASCADE RPTED THEY HAD SEEN 4500 FT. I WAS AT FAULT FOR MISUNDERSTANDING THE CLRNC; AND I WAS ALSO AT FAULT FOR ALLOWING ATC TO DISTRACT ME FROM MY FIRST JOB; FLYING THE AIRPLANE. I DO WANT TO PUT ON RECORD THAT THE CTLR USED AN INTIMIDATING; AND DEMEANING TONE; BUT I DON'T PUT HIM AT FAULT FOR THE REACTION WE HAD. IN THE FUTURE; I WILL DOUBLE-CHK THE CLRNC AND REALIZE THAT JUST BECAUSE THE OTHER PLT AGREES WITH A PROC; OR OBSTACLE DEP PROC; HIS/HER CONFIRMATION DOES NOT MEAN WE ARE RIGHT. I ALSO WILL NOT ALLOW THE TONE OF A CTLR OR A BARRAGE OF QUESTIONS AT A CRITICAL TIME TO DISTRACT ME FROM FLYING THE AIRPLANE. NEXT TIME I WILL REQUEST THAT THEY STANDBY. I ALSO WANT TO RESTATE THAT I ACCEPT RESPONSIBILITY FOR THE DEVS.