A C441 SINGLE PLT MISUNDERSTOOD HIS CLRNC; COMMITTING A HDG TRACK DEV IN P50'S AIRSPACE.

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MY DEP CLRNC FROM SDL WAS THE BANYO 4 DEP; RADAR VECTORS TO V567 TO WINSLOW; AZ (INS); MAINTAIN 5000 FT; EXPECT 17000 FT IN 3 MINS. I CONTINUED RWY HDG WHEN I TOOK OFF. I SHOULD HAVE TURNED L TO 260 DEGS TO INTERCEPT THE DEP ON MY OWN; BUT DIDN'T. I THOUGHT I WOULD GET A VECTOR TO INTERCEPT THE DEP RTE; BUT SHOULD HAVE TURNED TO 260 DEGS ON MY OWN TO INTERCEPT THE DEP ASSIGNED. I FEEL THAT THE GOOD VFR CONDITIONS CAUSED ME TO BE LAX IN STUDYING; AND PROPERLY EXECUTING; THE CLRNC AS IT SHOULD HAVE BEEN. THIS WAS A GREAT ERROR ON MY PART. ALTHOUGH THERE WERE NO IMMEDIATE DANGERS THIS TIME; IF THE WX HAD BEEN BAD AND I WOULD HAVE HAD AN ENG FAILURE; THERE COULD HAVE BEEN TERRAIN PROBS. MAYBE THE HDG SHOULD BE GIVEN IN A CLRNC LIKE THIS WHEN THE DEP WAS ISSUED; ALTHOUGH I REALIZE THAT IT IS THE PLT'S RESPONSIBILITY TO PROPERLY STUDY THE ROUTING. SHOULD THE TWR VISUALLY OR VERBALLY ASSURE THE ACFT HAS MADE THE TURN? AS MANY SAFEGUARDS AS POSSIBLE; WOULD SURELY BE GOOD. GOT A VECTOR BACK ON COURSE.