How Do I Sort My Puk/Pin Code On My Lg Chocolate Phone?

OMG! I Have Really Stuffed Ma Phone! I Tried To Sort Out My Pin/Puk Code But Its Just Gone Dodgey! I Can't Get It Off It, It Just Always Comes Bk Even If I Take The Sim Card Out Etc! Someone Please Help Me Or I Am In Some Deep Trouble With The Parents And I'll Not Be Getting A New Phone Any Time Soon =[! I Only Have 6 Tries And I Dont Know What It Does When I've used Them All!