if you went to any of the harry potter premieres could you help me please???..........

if so could you tell me about the deathly hallows premiere how to get into the crowd or do i need to pay for getting in plese tell me i really wanna go but i ma not sure how to get in could you help me please :)..........could you tell me where to be and when to get up at so i could be there aerly and were to be so i can get autographs????