First hole is the top hole or where the engine is deepest in the water. Second is the next one and so on. As for moving the engine, I use use the trailer jack and a block of wood. You jack the bow all the way down, then trim the engine down to straight vertical. Then place a block of wood below the keg to protect it from the concrete. Then I totally remove the top bolts and loosen the bottom bolts. Then when you jack the bow back up the transom will move down in relation to the engine that