I am installing 1.5 inch trim around three sides of a patio that is attached to my house.I started an the front and the trim goes at the very top of the wall just underneath the soffit.when i get to the corner the roof is sloped and rises 12 degrees.to make this trim meet at the corner correctly do i cut a 45 degree outside corner cut on the trim on front and tilt the miter saw 12 degrees at 45 degree table turn to make the right cut to make the 2 peices meet correctly and start riseing 12 degrees to follow the roof line.Was not sure.Thanks