Ex puller here. I would say that during my biggest pulling phase I was mild to moderate. I used to pull along my parting and made it about an inch wide all along, and pulled a lot right at the end of my parting, so had a big bald spot on the back of my head.
one way you can stop is obvious, cut all your hair off. have it short so its too short to pull. if you have trouble with pulling your eyelashes and eyebrows i don't have much experience in it but i might recommend rubbing vaseline?
had my hair short for something like 4 years and forgot about the trich alogether. decided to grow it back and when i did, i got some all too familiar sensations on the "pulling" spots on my scalp, and some urges to pull.
the main thing that got me to stop was remembering how it was before. i didnt want to spiral down. so dont even pull that first hair! its easier not to pull the first hair than it is not to pull the seventeenth clump of hair if you get what i mean. once youve started its opened a door.
another thing, dont let it get too greasy. greasy hair goes into strings and feels a bit heavier so can make you tempted to pull. having clean dry hair helps some.
The thing that helped me most. Have a middle parting. having a side parting isn't really natural for your scalp and is what can cause this unusual sensation, hair being pulled in the wrong direction can be quite uncomfortable and might subconsciously make you want to pull it out altogether. one thing i think it may tie in with also is low self image. a side parting means a fringe over your face which means you may have poor confidence which may have some ties with your trichtillomania. i remember as soon as i gave myself the middle parting i began to panic that everyone would see my "ugly" face, but after a couple of days i got used to it and now i feel i'm better for it. can see the world more clearly.