Self Doubt with Niche

I was recently diagnosed with ADHD and want to help women with ADHD overcome their struggles but I don’t know if I can help them. I am still working on myself.

C-Present myself as an ADHD Coach
T- I don’t know enough yet
A-spin on a niche, do one post related to ADHD then back down, inconsistent messaging, contemplate signing up for more training
R- don’t build a program or help clients who have ADHD

The doubt is so strong that I truly believe I don’t know how to help them.
This is the result I want but I’m stuck: Build a program and help clients who have ADHD