AN ATX PA31 TAXIES ACROSS THE HOLD SHORT LINE FOR RWY 4L AT BOS DURING A NIGHT OP.

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AFTER RECEIVING MY IFR CLRNC FROM BOS TO ROC; I CALLED BOS GND CTL FOR TAXI INSTRUCTIONS. AFTER SOME CONFUSION OVER IF I CONTACTED CLRNC DELIVERY FIRST (WHICH I DID); I WAS INSTRUCTED TO TAXI TO HOLD POINT B. I ASKED FOR DIRECTION TO HOLD POINT B BUT RECEIVED NONE. I WAS ABLE TO FIND THE HOLD POINT USING AN ARPT CHART; EVEN THOUGH A JET AIRLINER WAS BLOCKING THE SIGN FROM VIEW WHEN EXITING THE GA RAMP. I WAS THEN INSTRUCTED TO TAXI TO RWY 4L. I STARTED TO TURN THE AIRPLANE R TO SEE IF I COULD SEE A DIRECTION SIGN TO RWY 4L. THE GND CTLR TOLD ME THAT I WAS ABOUT TO GO THE WRONG WAY AND TOLD ME TO TAXI TO TXWY W TO RWY 4L. DURING AND AFTER THE TURN ONTO TXWY W; I WAS VERY CONCERNED ABOUT FINDING THE HOLD LINE AND/OR THE RWY SIGN. I SAW NEITHER AND WAS JUST ABOUT TO ENTER ONTO RWY 4L WHEN I REALIZED THAT I TAXIED TOO FAR. I IMMEDIATELY CALLED THE TWR AND TOLD THEM WHAT HAPPENED; AND ASKED IF I COULD DO A 180 DEG TURN TO GO BACK. THEY INSTRUCTED ME TO CROSS THE RWY AND TO HOLD ON THE OTHER SIDE; WHICH I DID.