An alternative cooking method is using a slow cooker. Cooking time would take about 8 hours or longer for best results. There's no need to marinate the meat.
Browning the pork is optional but it is worth doing it before it goes to the oven. Searing helps develop the flavor more.
To save up on washing, use an oven-proof pot or pan (with lid) to sear the meat if you have one. Otherwise, use a roasting pan or any oven-proof pan and then cover it tightly with foil.