Tips on legs over head method

From past few weeks I've been trying to eat it through my hands (after cumming on them) but the pnc just hits hard and i stop myself. I think the only way left now for me to do this is legs over head method. I need help with aiming, those who do it how do you all aim it in a way it doesn't splash all over your face? how to make my aim so accurate that all of it goes straight into my mouth?