100% safe? Well like anything else that depends on what you do. If you keep it mild with just some spanking and handcuffs you'll probably be all right. The more extreme you get the more likely something may go wrong. The best thing to do is research the hell out of anything you plan on trying. If it's an instrument you plan to use to beat her with, try it out on yourself first to test how hard it hits. As for general advice I have some here, but if you'd like some more feel free to contact me.