CPR SMA VFR IN IMC AFTER TKOF FROM FTY WITH A FLT PLAN FILED BUT NEVER ACTIVATED.

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I FLEW THE COMPANY SMA FROM HOME BASE TO FULTON COUNTY 15 MINS AWAY FOR AUTOPLT MAINT. A FRONT APCHING GAVE ME HIGH OVCST WITH GOOD VFR FOR MY ARR AT COUNTY BUT PROMISED MIXED IFR CONDITIONS THROUGHOUT THE DAY. TRUE TO MY PREFLT PREDICTIONS DURING THE 8 1/2 HRS ON THE GND THERE WERE IFR AND VFR CONDITIONS MOVING ACROSS THE ARPT ALL DAY LONG. LATE AFTERNOON BROUGHT DEFINITE IMPROVEMENT WITH MVFR TO VMC AND OCCASIONAL BUT MORE RARE IMC. THE AUTOPLT CHKED OUT PERFECTLY AND I FILED A FLT PLAN BACK TO CTJ. HOWEVER; I THEN DECIDED TO SHOOT 1 ILS WITH THE AVIONICS TECH IN THE AIRPLANE SO I CALLED GND WITH MY REQUEST OF 1 ILS TO FULL STOP. I THEN ASKED THEM TO CALL ATL APCH AND WORK THAT OUT WITH THEM SO THERE WAS NO CONFUSION SINCE I DID HAVE A FLT PLAN ON FILE. GND SAID WE ARE VFR NOW SO YOU CAN JUST TKOF VFR AND WORK THAT OUT WITH ATL APCH. MY FIRST MISTAKE: I FELT THE ARPT WAS PROBABLY VMC AND I SIMPLY SAID ROGER. I SHOULD HAVE REQUESTED AN IFR CLRNC WHILE STILL ON THE RAMP. NEVER AGAIN. AT 500 FT AGL I SUDDENLY REALIZED I WOULD SOON BE IN IMC AND CALLED TWR TO REQUEST FREQ CHANGE SO I COULD WORK OUT THE 'PRACTICE' ILS WITH ATL APCH. THIS WAS MY SECOND MISTAKE. I SHOULD HAVE TOLD TWR OF MY CONDITIONS AND REQUESTED AN IFR CLRNC BACK INTO FTY. I SWITCHED AND CALLED ATL; 'ATL APCH IT IS ACFT IDENT REQUESTING 1 PRACTICE ILS WITH FULL STOP AT COUNTY.' HIS RESPONSE; 'ACFT IDENT UNABLE.' I WAS AT THAT POINT IN AND OUT OF CLOUD BASES AT 600 FT AGL AND GLIMPSING TWRS IN THE AREA. THE IRONY AND MY FOOLISHNESS STRUCK ME; SUCH A CAREFUL LAW ABIDING PLT; AS I BEGAN MY VFR CLB THROUGH IMC. TO AVOID THE POSSIBLE TWRS IN THE AREA I HEADED NW FOR THE VFR PRACTICE AREA. I KNEW AT LEAST I WOULD AVOID ALL GND OBSTRUCTIONS DURING MY CLB. I BROKE OUT AT 3500 FT MSL ON TOP OF A BROKEN LAYER OF PUFFY CUMULUS CLOUDS AND ALMOST IMMEDIATELY SAW GOOD VMC THROUGH A HOLE LEADING TO THE PRACTICE AREA. I CAREFULLY FLEW DOWN THROUGH THE HOLE TO LEGAL VMC WITH IMPROVING SKIES TO THE W; MY NEW HDG. I CALLED ATL APCH AND THIS TIME REQUESTED AND GOT AN IFR CLRNC INTO COUNTY. I BELIEVE MY ACTIONS WENT UNNOTICED BECAUSE FOR THE REST OF THE FLT INTO COUNTY AND THE FLT HOME NO ONE SAID ANYTHING ABOUT MY UNUSUAL CLB AND DSCNT. I DID REALIZE IMMEDIATELY THAT I HAD IN EFFECT GIVEN UP MY COMMAND OF THE AIRPLANE WHEN WHILE STILL ON THE GND I ACCEPTED SOMEONE ELSE'S OPINION THAT COUNTY WAS VMC. IT WASN'T JUST VMC OVER THE ARPT AND NOWHERE ELSE EITHER. I CAN SAY THIS BECAUSE BEFORE CLRING THE DEP END OF THE RWY I HAD TO LEVEL OFF JUST TO AVOID CLOUDS AT 600 FT. I DEFINITELY LEARNED SEVERAL LESSONS; FORTUNATELY WITHOUT ANY TFC CONFLICTS. THERE IS NO SUCH THING AS A PRACTICE ILS ON SUCH A WX DAY. I CAN AND WILL ALWAYS ASK FOR AND RECEIVE A CLRNC IF THERE IS THE SLIGHTEST CHANCE OF IMC. I WILL ALSO STRIVE TO NEVER AGAIN INADVERTENTLY GIVE UP MY RESPONSIBILITIES AS PIC TO A CTLR.