Edge metal never comes the same length as your roof, so overlaps are inevitable.
The sections that are folded will not overlap without causing an ugly hump, so smart flashers cut off the folded parts to the same depth as the overlap.
This edge metal has a hem along the top, which has to come off, too.
Round over the corner to make sliding the pieces together a smooth operation.
Also, use focal point to choose which piece to overlap, Begin farthest away and overlap toward the view point to make your overlap seams disappear.