I just had a lesson. It was a trip. I’m very good with my hands, like using tools, have good dexterity etc., it is NOT an easy thing to do right. The main issue is “wrap around”. It is surprisingly difficult (at least for me) to get the right technique, control the weight of the blows and to hit the target correctly. Some of it is non-obvious. I am planning to get more instruction and supervision before doing it on my own. The last thing you want to do is mess it all up, hurt and scare your partner because if they don’t have a good time it could be a downer. Also I strongly suspect that there is a learning curve for the person receiving.