You have a total of 12 bolts that hold down the lower manifold. 6 on the left and 6 on the right. Tighten all bolts hand tight first. The following is the tightening squence you need to use. Left side starting with front bolt. Tighten order is 12, 5, 4, 2, 7, 10, Right side starting with the front bolt. 11, 6, 1, 3, 8, 9.
Start with bolt number one and work your way to bolt number 12. You need to tork them down to 35 ft. pounds (48Nm). Sorry didn't have any diagrams handy.