Place each of the 9x7 end boards flat on a work table. On one of the 7-inch edges, make a mark in the center (3-1/2 inches in from each end). Then, working in from this end, make a mark on each side 2-1/4 inches along each side. Finally, on the opposite end, make a mark 1-1/2 inch in from each end. Draw pencil lines between the marks to denote the cut lines. Refer to page 3 of the free bird feeder plans you downloaded in step 1 for reference.
Using a miter saw or circular saw, cut along the pencil marks to create the angled sides of the bird feeder.