If it has a plug obviously use that first but there will probably be a significant amount left in the pan afterwards. Once most of the fluid has drained from the drain hole use the procedure I outlined but start with the side closest to the open drain hole. Also make sure to use a small cup/dish/bowl etc to hold your bolts so you don't loose them, you local auto parts store should have some magnetic trays that are ready good at this. These are what I use as a professional mechanic.