What's the best self-help resource you've found for overcoming anxiety?

Getting therapy, particularly talking therapy with a qualified therapist. I know this doesn't answer your question exactly, but it'll very likely help you uncover the root of the anxiety and manage it way better. It's one of the best things I can recommend. If you must go down the self help route, I'd consider looking at physical changes as well as the things your looking for, such as exercise, diet, relationships, getting outdoors, and so on. Good luck.

Get yourself diagnosed properly. I let my anxiety control my life for far too long, now I am on the correct drugs, my quality of life is WAY better.

Cognitive Behavior Therapy. Re-framing how you see things.

Could you elaborate? What do you mean by anxiety?