Here I am, staining away in the hot sun!
I do love to stain, though. The color is “Cedar Naturaltone” from Flood stains color chart.
Here is a close-up of an installed shutter. Using long screws (I think they were called deck screws), we screwed the first board next to the window taking care to have it perfectly aligned next to the moulding top & bottom. We screwed one screw top and one screw bottom, where the cross board would go, so as to hide the screw head. We used another board on its end for the spacer and screwed the next length of board to the house. Then, we screwed the cross boards on, using a level to keep it level (novel idea, eh! LOL). We used black drywall screws here.