When should you announce your sobriety plan?

Well I got a plan in place,im going to give this online therapy a go, its time to cut out drinking and other demons holding me back. The thing is I don't know when i should tell my friends my plans, I'm so worried i will fail after 1-2 weeks (like it has in the past) and just be embarrassed and disappointed. Would you wait a couple weeks before you share your sobriety? Any feedback would be great! Thanks for listening!