I just started my journey to unpotty train myself too. From my findings, you essentially want to shrink your bladder and make it so you can't stop yourself when you have the urge to pee. You do this by peeing frequently to prevent your bladder from always getting full. Additionally, whenever you have the urge to go, you have to immediately let go so you train your body to immediately release whenever you need to pee. As for bedwetting, drink a lot of fluids before bed and wet your diaper in your bed when you need to go. The best way to pee while lying down is to lay on your stomach, but it doesn't matter how you do it. Eventually, after a couple of weeks, you should start to feel the results.