What are some good techniques to try to stop a panic attack before it happens?

It depends on the origin of the panic attack. What has helped for me is, instead of being reactionary (if you're not in a state where thinking of your situation will trigger you automatically), identify your anxieties, identify their origins, acknowledge them for what they are and simply let them pass. Do not suppress your feelings: acknowledge them as being part of you, not degrading yourself for having these feelings, but let them go if it isn't helping you. If you can remove yourself from the situation and have a nice caffeine free drink and chill out. Be proactive. If you're around people who give you anxiety, or if you feel it elevating, remove yourself. Sometimes you don't know when it's going to hit, but if you feel it building at all and have time to refresh yourself, GO RESET!!! Even if it's "not that bad" it's easier to deal with negative influences with a blank canvas.

Practice calmness and meditation, self-love affirmations. Gratefulness journals. I see panic attacks as a large amount of negative energy in one's body. If you start to see and feel life as more positive, you wont be a match to have panic attacks as much, or at all. Panic attacks are terror and fear. Positive energy blots that all out.

Control your breathing. Most panic attacks cause rapid and shallow breathing which fuels the attack, causing the symptoms to linger. By controlling your breathing, you can help to return your heart rate to normal, lower your blood pressure, slow the sweating, and re-establish a feeling of being in control.

Try and get outside, deep breathing techniques, distract yourself, play with an animal, dance to your favourite song.

When I feel a panic attack coming, I try to do something calming and repetitive, like knitting. It serves as a distraction without being difficult to think about. I also breathe deeply from my stomach and let the air out slowly.

Distract yourself by doing something thay can make you smile no matter what. Stay there and recollect your thoughts. Dont forget to breath. You're doing great

Taking deep breaths helps and thinking positive thoughts also can prevent a panic attack. taking your mind off of the topic creating a panic attack may also work. everyone finds something different that helps themselves the most.

Check your environment and surroundings. Sometimes just going out for a walk or getting some fresh air can make an incredible difference. If possible, put some music on (classical is an excellent choice for calming the mind)! Remind yourself that you have the ability to control the anxiety!

Square breathing! You breath in for 4 seconds, then out for 4 seconds, and do it 4 times. Also paying attention to one thing, describe the object and the things around/ on it.

Hmm, I would try to get my mind off of whatever that's bothering me. I would try to relax as much as possible, and go to a place where I feel the most comfortable (in bed, around family, etc.) Hope this helps :)