The hard part about this is when you reach that point of no return when you know you are going over. I am used to unhooking myself unconsciously from the trap so that when I do go over I have an exit strategy that doesn't involve going into/through the sail. That is my main issue with trying to tether myself to the boat. I sail in relatively protected waters so I have not really given it a lot of thought before. Robi described a system he uses with a snap shackle I believe which he thinks works pretty well. He shackles himself into the loop of mainsheet/traveler.