I could do them decently for a while but am now too chicken to do them on anything except tiny stuff.
I never hit my tail on them, just bonk the coping, suck up your legs and float over. Do a whole bunch of spine transfers to tail to get comfortable with the feeling of going over. Eventually you try going faster and launching over, and then eventually you commit and stay on your board. When you actually do it, it’s not much different mechanically than pumping a pump bump. It’s really a commitment trick as opposed to something that takes a lot of finesse. Some people find it easier to grab but I can barely touch my toes.