Shake your own hand and see how each hand fits into the other. Shake hands with yourself with the other hand on top and see what seems more comfortable and note to yourself this habbit of yours. Now work with yourself using low tenstion on how one hand can lever and direct the other and where it fits best for you to place your hands and how you can guide the tension from one hand to the other without tensing up yourself.
Do the same drill of learning and gaining awareness with a partner and note differences between partners so you don’t adopt a single mindset and add to this a surprise or reading people drill. Come toward each other and forward a hand to a handshake. Do it a few times in a regular mannar and than work to control your partner without any harmful intension and see if you can read each other and choose an effective course of action.