Start out slow. For changing an adult baby, make sure you have enough space, he's comfortable, and your supplies are near by. if you tear any plastic off the diaper pulling off the taps, no big deal, it's going in the trash. once its off or open get any spot that is wet or messy. You will want to get all the mess off much as possible to avoid rashes. for the fresh diaper make sure its perfect where its at and up high enough in the back and the front. They always say start with the bottom taps when diapering up so the bottom won't have any leaks. once your done make sure its on good and if its ok on him.