space for practicing parallel parking in NJ with a 99 Toyota Camry?

The dmv site says ill have i have 25ft in length for room, and i have to be parked 6 inches from the curb, but how far from the curb do i place these cones to practice with? Also, i measured out 25 feet length, and it seems a little bit to much? im not sure. can someone help me with the placing of these cones so i can practice. Thanks
 
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