Many people will tell you step by step from preppy to punk, or preferably to pacify into punk, or you might be like a poser.
This is true, but there is no way from punk to punk overnight.
You can not buy punk music knowledge, you can not get an entire punk wardrobe without search effort.
To show, introduce yourself to the other Parker, and gradually your style will develop from there.Go to punk show, you can always see the band's life.
The energy is amazing you do not have to go into the Moss pit, but it looks very interesting.
Play safe, have fun to understand your local scene, with the passage of time, you may see the same characters and bands in the program.Familiar with old and new music.