While I did not have BPPV, I did do vestibular rehabiltiation for vertigo. I found it VERY helpful. I had already been suffering for months with severe vertigo at that point and it was already lessoning, but I wished I'd been sent for it immediately. The first visit was awful though. I was used to avoiding things that triggered it, not specifically doing them.
The biggest thing for me was really identifying triggers. It helped me know what to avoid, and also what to "rehearse" in a safe time and space. It also helped me realize I didn't have to totally avoid triggers, but could learn to push through them. Since I still have slight vertigo as an apparently long term issue, it's been helpful in learning to live with it. It was really helpful in helping me learn what I can do and can't do.
If you do have BPPV, the good news is that if those crystals rearrange with the exercise, the vertigo will go away! A lot of people have great success with the positioning.