How do I train myself to stop touching my face?

I'm anxious pretty often and fidget a lot. Play with my hair, touch my ear jewelry, rest my face on my hand. It's a habit I'm having a hard time breaking, but need to for reasons we all know of course.

I know it should be as simple as noticing and stopping, but it's such second nature to me that I forget in no time and do it again anyway.

Any suggestions would be great.