Hi frnds, i bought this Beauty Samsung i8910 HD last sunday

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its really very amazing phone

.........powerful specs and an amazing display

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Actually i wanna flash this phone to Italian firmware..........
The battery is really giving me very trouble and some issues too

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I've already downloaded the "Italian firmware XXII1-Generic Italy and Symbian ROM Flashing Tool v1.50"..........
But i dont wanna commit any mistake

as it can make it brick

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So plzzzzzz can anybody guide me step by step to flash it.........
And whats the best cooked rom for this phone.........plz help me