The last poster offered good advice I think... it's embarrassing for me to say, but since I've never been able to admit it to anyone irl, I have some form of trich. It was worse in my late teens, early 20's, but I still pull to this day. I have a different case though... yes I pull when I am stressed, but I don't really mean to pull. I just play with certain parts of my hair a lot and it just comes out. Always makes me so mad when it happens. I also do this habit because sometimes my hair just genuinely bothers me! It pokes me behind my ears, especially the left ear, and while trying to find that "one hair" that is doing it I end up pulling 1, or 2, or even 3 out by accident. Of course, it never helps and I still feel bugged by a pokey hair I cannot find. I think it's some sort of nervous super-sensitivity. I have in the past developed actually bald areas around my ears and/or crown areas because of this. I started wearing hats to hide this. Now as an adult, because I still have this issue, I still wear a hat. It makes me feel safe and less insecure, even though my hair is fine. I just feel like everyone can see the damage and knows what I do. I can't stand not wearing a hat in public; whenever I have to I feel embarrassed and under attack, if that makes sense. Plus when I wear hat I don't pull or play with my hair. Weirdest thing!
Keeping the hands or mind occupied is good advice in general. If you're focused on something you are less inclined to resort to hair pulling. I love to go fishing, for example, and when I am fishing, I don't think about anything else. I enter a state of zen or serenity where nothing else matters and I don't play with my hair or pull it. But if working with clay or stress balls does this for you, excellent! What made me change my habits was when I finally got a mirror and looked at how bad I actually looked. I cried for weeks about it. Unfortunately, my initial approach to reducing it was not healthy... won't go into what I did at this time. But once I found some hobbies that took my mind off of it, I've been able to gradually improve. Even though I still play and pull, least I don't have any terribly noticeable spots! Even barbers don't notice! Take it one step at a time is my best advice. Every hair you don't pull is a success.