I've had two different chiropractors (who had no financial interest in me, as I was from a different town and simply met them socially) see me adjust my own neck, and mutter disgustedly, "Self adjusters. More harm than good."

I still do it... but based on that experience I wonder if a chiropractor (who always goes to another professional to have h/h own spine adjusted) would really teach a patient to do their own.

Now, doing simple spine twists to crack the lower spine, I assume is safe?