I'm moving toward getting away from my husband

I'm trying to get as much against him as I can

My older 2 girls are meeting with a therapist who does counseling for abuse victims
She says that she often works with the courts

I'm reading a book called 'why does he do that' it's very eye opening for me and just furthers my belief that he won't change

I'm in a chapter regarding custody and visitation and I'm just terrified that he'll work his charm and the courts will fall for him and grant him partial custody or at least unsupervised visitation

He is already abusive toward the kids, I don't want to think what will happen if they are forced to visit him without someone to protect them from him

Im afraid the therapist won't find anything convincing
I'm afraid that I'll be seen as exaggerating things

Is it worth it for me to leave?
I can see the effects on them of him but the thought of them alone with him....