That is exactly why we call BDSM a community.Mostly, it's damned hard to keep people FROM showing you How They Do It.
if there is any sort of BDSM community in your area, they will have outreach events, and probably classes in everything from "knot tying 101" to "how to kneel over and over again without losing your kneecaps."
One good way to find them is via fetlife.com. Look for "munches" in your area.